Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module (patchset #13 id:240001 of https://codereview.chromium.org/1815823002/ )

Reason for revert:
red bots

Original issue's description:
> Move SkGLContext and some GrGLInterface implementations to skgputest module
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1815823002
> CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot
>
> Committed: https://skia.googlesource.com/skia/+/fe3456cb006110d045b26ff3f8681b893a757b58

TBR=jvanverth@google.com,bsalomon@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1845473004
diff --git a/tools/skiaserve/Request.cpp b/tools/skiaserve/Request.cpp
index d9e1bda..1d946ab 100644
--- a/tools/skiaserve/Request.cpp
+++ b/tools/skiaserve/Request.cpp
@@ -10,8 +10,6 @@
 #include "SkPictureRecorder.h"
 #include "SkPixelSerializer.h"
 
-using namespace sk_gpu_test;
-
 static int kDefaultWidth = 1920;
 static int kDefaultHeight = 1080;
 
@@ -65,8 +63,8 @@
 SkCanvas* Request::getCanvas() {
 #if SK_SUPPORT_GPU
     GrContextFactory* factory = fContextFactory;
-    GLContext* gl = factory->getContextInfo(GrContextFactory::kNative_GLContextType,
-                                            GrContextFactory::kNone_GLContextOptions).fGLContext;
+    SkGLContext* gl = factory->getContextInfo(GrContextFactory::kNative_GLContextType,
+                                              GrContextFactory::kNone_GLContextOptions).fGLContext;
     gl->makeCurrent();
 #endif
     SkASSERT(fDebugCanvas);