Make it possible to blacklist gpu's based on the Windows experience index.

content/browser/gpu/gpu_data_manager.h

Index: content/browser/gpu/gpu_data_manager.h
===================================================================
--- content/browser/gpu/gpu_data_manager.h	(revision 130192)
+++ content/browser/gpu/gpu_data_manager.h	(working copy)
@@ -15,7 +15,6 @@
 #include "base/observer_list_threadsafe.h"
 #include "base/synchronization/lock.h"
 #include "base/values.h"
-#include "content/browser/gpu/gpu_performance_stats.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/gpu_feature_flags.h"
 #include "content/public/common/gpu_info.h"
@@ -81,8 +80,6 @@
   // Caller is responsible for deleting the returned value.
   Value* GetFeatureStatus();
 
-  GpuPerformanceStats GetPerformanceStats() const;
-
   std::string GetBlacklistVersion() const;
 
   void AddLogMessage(Value* msg);