Revert of Add config options to run different GPU APIs to dm and nanobench (patchset #18 id:340001 of https://codereview.chromium.org/1490113005/ )

Reason for revert:
This CL changed 1200 images on gold, when I wouldn't expect any diffs from the description.

Original issue's description:
> Add config options to run different GPU APIs to dm and nanobench
>
> Add extended config specification form that can be used to run different
> gpu backend with different APIs.
>
> The configs can be specified with the form:
> gpu(api=string,dit=bool,nvpr=bool,samples=int)
>
> This replaces and removes the --gpuAPI flag.
>
> All existing configs should still work.
>
> Adds following documentation:
>
> out/Debug/dm --help config
>
> Flags:
>     --config:	type: string	default: 565 8888 gpu nonrendering
>         Options: 565 8888 debug gpu gpudebug gpudft gpunull msaa16 msaa4
>         nonrendering null nullgpu nvprmsaa16 nvprmsaa4 pdf pdf_poppler skp svg
>         xps or use extended form 'backend(option=value,...)'.
>
>         Extended form: 'backend(option=value,...)'
>
>         Possible backends and options:
>
>         gpu(api=string,dit=bool,nvpr=bool,samples=int)	GPU backend
>         	api	type: string	default: native.
>         	    Select graphics API to use with gpu backend.
>         	    Options:
>         		native			Use platform default OpenGL or OpenGL ES backend.
>         		gl    			Use OpenGL.
>         		gles  			Use OpenGL ES.
>         		debug 			Use debug OpenGL.
>         		null  			Use null OpenGL.
>         	dit	type: bool	default: false.
>         	    Use device independent text.
>         	nvpr	type: bool	default: false.
>         	    Use NV_path_rendering OpenGL and OpenGL ES extension.
>         	samples	type: int	default: 0.
>         	    Use multisampling with N samples.
>
>         Predefined configs:
>
>         	gpu      	= gpu()
>         	msaa4    	= gpu(samples=4)
>         	msaa16   	= gpu(samples=16)
>         	nvprmsaa4	= gpu(nvpr=true,samples=4)
>         	nvprmsaa16	= gpu(nvpr=true,samples=16)
>         	gpudft    	= gpu(dit=true)
>         	gpudebug  	= gpu(api=debug)
>         	gpunull   	= gpu(api=null)
>         	debug     	= gpu(api=debug)
>         	nullgpu   	= gpu(api=null)
>
> BUG=skia:2992
>
> Committed: https://skia.googlesource.com/skia/+/e13ca329fca4c28cf4e078561f591ab27b743d23
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1490113005
>
> Committed: https://skia.googlesource.com/skia/+/c8b4336444e7b90382e04e33665fb3b8490b825b

TBR=mtklein@google.com,bsalomon@google.com,scroggo@google.com,kkinnunen@nvidia.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:2992

Review URL: https://codereview.chromium.org/1536963002
diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index 638477e..11119be 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -28,7 +28,6 @@
 #include "SkCanvas.h"
 #include "SkCodec.h"
 #include "SkCommonFlags.h"
-#include "SkCommonFlagsConfig.h"
 #include "SkData.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
@@ -169,10 +168,11 @@
                                                   0;
         SkSurfaceProps props(flags, SkSurfaceProps::kLegacyFontHost_InitType);
         this->surface.reset(SkSurface::NewRenderTarget(gGrFactory->get(this->config.ctxType,
+                                                                       kNone_GrGLStandard,
                                                                        this->config.ctxOptions),
                                                          SkSurface::kNo_Budgeted, info,
                                                          this->config.samples, &props));
-        this->gl = gGrFactory->getContextInfo(this->config.ctxType,
+        this->gl = gGrFactory->getContextInfo(this->config.ctxType, kNone_GrGLStandard,
                                               this->config.ctxOptions)->fGLContext;
         if (!this->surface.get()) {
             return false;
@@ -390,7 +390,7 @@
     if (!is_cpu_config_allowed(name)) {
         return false;
     }
-    if (const GrContext* ctx = gGrFactory->get(ctxType, ctxOptions)) {
+    if (const GrContext* ctx = gGrFactory->get(ctxType, kNone_GrGLStandard, ctxOptions)) {
         return sampleCnt <= ctx->caps()->maxSampleCount();
     }
     return false;
@@ -446,13 +446,11 @@
         GPU_CONFIG(gpudft, kNative_GLContextType, kNone_GLContextOptions, 0, true)
         GPU_CONFIG(debug, kDebug_GLContextType, kNone_GLContextOptions, 0, false)
         GPU_CONFIG(nullgpu, kNull_GLContextType, kNone_GLContextOptions, 0, false)
-#if SK_ANGLE
-#ifdef SK_BUILD_FOR_WIN
+#ifdef SK_ANGLE
         GPU_CONFIG(angle, kANGLE_GLContextType, kNone_GLContextOptions, 0, false)
-#endif
         GPU_CONFIG(angle-gl, kANGLE_GL_GLContextType, kNone_GLContextOptions, 0, false)
 #endif
-#if SK_COMMAND_BUFFER
+#ifdef SK_COMMAND_BUFFER
         GPU_CONFIG(commandbuffer, kCommandBuffer_GLContextType, kNone_GLContextOptions, 0, false)
 #endif
 #if SK_MESA
@@ -1168,7 +1166,7 @@
 #if SK_SUPPORT_GPU
             if (FLAGS_gpuStats && Benchmark::kGPU_Backend == configs[i].backend) {
                 GrContext* context = gGrFactory->get(configs[i].ctxType,
-                                                     configs[i].ctxOptions);
+                                                     kNone_GrGLStandard, configs[i].ctxOptions);
                 context->printCacheStats();
                 context->printGpuStats();
             }