Minor improvement in uniform block backing buffer validation.

gpu/command_buffer/service/buffer_manager.h

Index: gpu/command_buffer/service/buffer_manager.h
diff --git a/gpu/command_buffer/service/buffer_manager.h b/gpu/command_buffer/service/buffer_manager.h
index 2778a7328b97d001fc4a486af12fd67cd2f682f6..5546aad307b9b8a980f08d28ca9bf14907cbfb15 100644
--- a/gpu/command_buffer/service/buffer_manager.h
+++ b/gpu/command_buffer/service/buffer_manager.h
@@ -337,10 +337,6 @@ class GPU_EXPORT BufferManager : public base::trace_event::MemoryDumpProvider {
       const char* func_name,
       const char* message_tag);
 
-  uint32_t mapped_buffer_count() const {
-    return mapped_buffer_count_;
-  }
-
  private:
   friend class Buffer;
   friend class TestHelper;  // Needs access to DoBufferData.
@@ -391,9 +387,6 @@ class GPU_EXPORT BufferManager : public base::trace_event::MemoryDumpProvider {
                GLenum usage,
                bool use_shadow);
 
-  void IncreaseMappedBufferCount();
-  void DecreaseMappedBufferCount();
-
   std::unique_ptr<MemoryTypeTracker> memory_type_tracker_;
   MemoryTracker* memory_tracker_;
   scoped_refptr<FeatureInfo> feature_info_;
@@ -420,10 +413,6 @@ class GPU_EXPORT BufferManager : public base::trace_event::MemoryDumpProvider {
   bool lost_context_;
   bool use_client_side_arrays_for_stream_buffers_;
 
-  // Keep track of total mapped buffer count. In most use cases it should be 0,
-  // so we could bypass checking each individual buffer as an optimization.
-  uint32_t mapped_buffer_count_;
-
   DISALLOW_COPY_AND_ASSIGN(BufferManager);
 };