Make GrGpuResource::gpuMemorySize non-virtual w/ onGpuMemorySize virtual impl

src/gpu/GrGeometryBuffer.h

Index: src/gpu/GrGeometryBuffer.h
diff --git a/src/gpu/GrGeometryBuffer.h b/src/gpu/GrGeometryBuffer.h
index c3e1c65252c4f7376a7abd016704308173abdf38..d6761831b1cdc9464fa46953cd97ce6da8050206 100644
--- a/src/gpu/GrGeometryBuffer.h
+++ b/src/gpu/GrGeometryBuffer.h
@@ -98,9 +98,6 @@ public:
         return this->onUpdateData(src, srcSizeInBytes);
     }
 
-    // GrGpuResource overrides
-    virtual size_t gpuMemorySize() const { return fGpuMemorySize; }
-
 protected:
     GrGeometryBuffer(GrGpu* gpu, bool isWrapped, size_t gpuMemorySize, bool dynamic, bool cpuBacked)
         : INHERITED(gpu, isWrapped)
@@ -110,6 +107,8 @@ protected:
         , fCPUBacked(cpuBacked) {}
 
 private:
+    virtual size_t onGpuMemorySize() const { return fGpuMemorySize; }
+
     virtual void* onMap() = 0;
     virtual void onUnmap() = 0;
     virtual bool onUpdateData(const void* src, size_t srcSizeInBytes) = 0;