Revert of rename sk_gpu_test::GLContext to sk_gpu_test::GLTestContext

bench/nanobench.cpp

Index: bench/nanobench.cpp
diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index 521824e97b23e6792a69bd728cf8c10a7b7e3ca4..235de02f578cce7d7b77efc3988fa29bb67dbc2d 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -58,7 +58,7 @@
     #include "GrContextFactory.h"
     #include "gl/GrGLUtil.h"
     using sk_gpu_test::GrContextFactory;
-    using sk_gpu_test::GLTestContext;
+    using sk_gpu_test::GLContext;
     SkAutoTDelete<GrContextFactory> gGrFactory;
 #endif
 
@@ -158,7 +158,7 @@
 #if SK_SUPPORT_GPU
 struct GPUTarget : public Target {
     explicit GPUTarget(const Config& c) : Target(c), gl(nullptr) { }
-    GLTestContext* gl;
+    GLContext* gl;
 
     void setup() override {
         this->gl->makeCurrent();