Cleanup GpuMemoryManager and helpers.

content/common/gpu/gpu_memory_uma_stats.h

Index: content/common/gpu/gpu_memory_uma_stats.h
diff --git a/content/common/gpu/gpu_memory_uma_stats.h b/content/common/gpu/gpu_memory_uma_stats.h
index 467619d35b8e1751db703ce4a447b54f0597cf51..f20376bddb67e6c27135df2ee34587e2294ad20e 100644
--- a/content/common/gpu/gpu_memory_uma_stats.h
+++ b/content/common/gpu/gpu_memory_uma_stats.h
@@ -15,8 +15,6 @@ struct GPUMemoryUmaStats {
   GPUMemoryUmaStats()
       : bytes_allocated_current(0),
         bytes_allocated_max(0),
-        bytes_limit(0),
-        client_count(0),
         context_group_count(0) {
   }
 
@@ -26,17 +24,8 @@ struct GPUMemoryUmaStats {
   // The maximum number of bytes ever allocated at once.
   size_t bytes_allocated_max;
 
-  // The memory limit being imposed by the memory manager.
-  size_t bytes_limit;
-
-  // The number of managed memory clients.
-  size_t client_count;
-
   // The number of context groups.
   size_t context_group_count;
-
-  // The number of visible windows.
-  uint32 window_count;
 };
 
 }  // namespace content