cc: Delete ContextProvider::MakeGrContextCurrent.

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index 771cfeaf0f2aa8de576895a4ca96d0a654530da1..3c653f915514ab943eed8b13545781e950483a1b 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -459,9 +459,6 @@ static SkBitmap ApplyImageFilter(GLRenderer* renderer,
   // texture.
   renderer->resource_provider()->Flush();
 
-  // Make sure skia uses the correct GL context.
-  offscreen_contexts->MakeGrContextCurrent();
-
   // Wrap the source texture in a Ganesh platform texture.
   GrBackendTextureDesc backend_texture_description;
   backend_texture_description.fWidth = source_texture_resource->size().width();
@@ -567,9 +564,6 @@ static SkBitmap ApplyBlendModeWithBackdrop(
   // texture.
   renderer->resource_provider()->Flush();
 
-  // Make sure skia uses the correct GL context.
-  offscreen_contexts->MakeGrContextCurrent();
-
   // Wrap the source texture in a Ganesh platform texture.
   GrBackendTextureDesc backend_texture_description;
   backend_texture_description.fConfig = kSkia8888_GrPixelConfig;