gpu:: Remove GpuDataManagerObserver::OnVideoMemoryUsageStatsUpdate().

content/public/browser/gpu_data_manager_observer.h

Index: content/public/browser/gpu_data_manager_observer.h
diff --git a/content/public/browser/gpu_data_manager_observer.h b/content/public/browser/gpu_data_manager_observer.h
index 64a6b9e17edcc1b2378588111e3c9ec0e2656cc5..79e0d6adfa30a5b1327535a603a21010c34aa207 100644
--- a/content/public/browser/gpu_data_manager_observer.h
+++ b/content/public/browser/gpu_data_manager_observer.h
@@ -11,10 +11,6 @@
 
 class GURL;
 
-namespace gpu {
-struct VideoMemoryUsageStats;
-}
-
 namespace content {
 
 // Observers can register themselves via GpuDataManager::AddObserver, and
@@ -24,10 +20,6 @@ class CONTENT_EXPORT GpuDataManagerObserver {
   // Called for any observers whenever there is a GPU info update.
   virtual void OnGpuInfoUpdate() {}
 
-  // Called for any observers whenever there is a GPU video memory update.
-  virtual void OnVideoMemoryUsageStatsUpdate(
-      const gpu::VideoMemoryUsageStats& video_memory_usage_stats) {}
-
   // Indicates that client 3D APIs (Pepper 3D, WebGL) were just blocked on the
   // given page, specifically because the GPU was reset recently.
   virtual void DidBlock3DAPIs(const GURL& top_origin_url,