Remove GrGpuTraceMarker hooks until we rethink the design

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index cb5eb761ed97545de92c79581b66863dcc23184a..7f1e4109fad9564e65fa6acbc25266d295878a3b 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -26,7 +26,6 @@ class GrDrawContext;
 class GrDrawTarget;
 class GrFragmentProcessor;
 class GrGpu;
-class GrGpuTraceMarker;
 class GrIndexBuffer;
 class GrLayerCache;
 class GrOvalRenderer;
@@ -332,9 +331,6 @@ public:
     // Called by tests that draw directly to the context via GrDrawTarget
     void getTestTarget(GrTestTarget*);
 
-    void addGpuTraceMarker(const GrGpuTraceMarker* marker);
-    void removeGpuTraceMarker(const GrGpuTraceMarker* marker);
-
     GrPathRenderer* getPathRenderer(
                     const GrDrawTarget* target,
                     const GrPipelineBuilder*,