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/tests/StringTest.cpp b/tests/StringTest.cpp
index 9e41c48..f621dc9 100644
--- a/tests/StringTest.cpp
+++ b/tests/StringTest.cpp
@@ -201,62 +201,9 @@
 
     results.reset();
     SkStrSplit("\n", "\n", &results);
-    REPORTER_ASSERT(r, results.count() == 0);
+    REPORTER_ASSERT(r, results.count() == 1);
 
     results.reset();
     SkStrSplit("", "\n", &results);
     REPORTER_ASSERT(r, results.count() == 0);
-
-    results.reset();
-    SkStrSplit("a", "\n", &results);
-    REPORTER_ASSERT(r, results.count() == 1);
-    REPORTER_ASSERT(r, results[0].equals("a"));
-}
-DEF_TEST(String_SkStrSplit_All, r) {
-    SkTArray<SkString> results;
-    SkStrSplit("a-_b_c-dee--f-_-_-g-", "-_", kStrict_SkStrSplitMode, &results);
-    REPORTER_ASSERT(r, results.count() == 13);
-    REPORTER_ASSERT(r, results[0].equals("a"));
-    REPORTER_ASSERT(r, results[1].equals(""));
-    REPORTER_ASSERT(r, results[2].equals("b"));
-    REPORTER_ASSERT(r, results[3].equals("c"));
-    REPORTER_ASSERT(r, results[4].equals("dee"));
-    REPORTER_ASSERT(r, results[5].equals(""));
-    REPORTER_ASSERT(r, results[6].equals("f"));
-    REPORTER_ASSERT(r, results[7].equals(""));
-    REPORTER_ASSERT(r, results[8].equals(""));
-    REPORTER_ASSERT(r, results[9].equals(""));
-    REPORTER_ASSERT(r, results[10].equals(""));
-    REPORTER_ASSERT(r, results[11].equals("g"));
-    REPORTER_ASSERT(r, results[12].equals(""));
-
-    results.reset();
-    SkStrSplit("\n", "\n", kStrict_SkStrSplitMode, &results);
-    REPORTER_ASSERT(r, results.count() == 2);
-    REPORTER_ASSERT(r, results[0].equals(""));
-    REPORTER_ASSERT(r, results[1].equals(""));
-
-    results.reset();
-    SkStrSplit("", "\n", kStrict_SkStrSplitMode, &results);
-    REPORTER_ASSERT(r, results.count() == 0);
-
-    results.reset();
-    SkStrSplit("a", "\n", kStrict_SkStrSplitMode, &results);
-    REPORTER_ASSERT(r, results.count() == 1);
-    REPORTER_ASSERT(r, results[0].equals("a"));
-
-    results.reset();
-    SkStrSplit(",,", ",", kStrict_SkStrSplitMode, &results);
-    REPORTER_ASSERT(r, results.count() == 3);
-    REPORTER_ASSERT(r, results[0].equals(""));
-    REPORTER_ASSERT(r, results[1].equals(""));
-    REPORTER_ASSERT(r, results[2].equals(""));
-
-    results.reset();
-    SkStrSplit(",a,b,", ",", kStrict_SkStrSplitMode, &results);
-    REPORTER_ASSERT(r, results.count() == 4);
-    REPORTER_ASSERT(r, results[0].equals(""));
-    REPORTER_ASSERT(r, results[1].equals("a"));
-    REPORTER_ASSERT(r, results[2].equals("b"));
-    REPORTER_ASSERT(r, results[3].equals(""));
 }