gpu:: Remove GpuDataManagerObserver::OnVideoMemoryUsageStatsUpdate().

content/browser/gpu/gpu_data_manager_impl.h

Index: content/browser/gpu/gpu_data_manager_impl.h
diff --git a/content/browser/gpu/gpu_data_manager_impl.h b/content/browser/gpu/gpu_data_manager_impl.h
index 0b2390750141690516b8688f76706034349b1e2e..6c616cf2833ac2ffbe36368d3bc8b9f38e98b635 100644
--- a/content/browser/gpu/gpu_data_manager_impl.h
+++ b/content/browser/gpu/gpu_data_manager_impl.h
@@ -75,7 +75,9 @@ class CONTENT_EXPORT GpuDataManagerImpl
   void RequestCompleteGpuInfoIfNeeded() override;
   bool IsEssentialGpuInfoAvailable() const override;
   bool IsCompleteGpuInfoAvailable() const override;
-  void RequestVideoMemoryUsageStatsUpdate() const override;
+  void RequestVideoMemoryUsageStatsUpdate(
+      const base::Callback<void(const gpu::VideoMemoryUsageStats& stats)>&
+          callback) const override;
   bool ShouldUseSwiftShader() const override;
   // TODO(kbr): the threading model for the GpuDataManagerObservers is
   // not well defined, and it's impossible for callers to correctly
@@ -113,9 +115,6 @@ class CONTENT_EXPORT GpuDataManagerImpl
   // of GPU rasterization. In the future this will be used for more features.
   void UpdateGpuFeatureInfo(const gpu::GpuFeatureInfo& gpu_feature_info);
 
-  void UpdateVideoMemoryUsageStats(
-      const gpu::VideoMemoryUsageStats& video_memory_usage_stats);
-
   // Insert disable-feature switches corresponding to preliminary gpu feature
   // flags into the renderer process command line.
   void AppendRendererCommandLine(base::CommandLine* command_line) const;