Disable GPU info collection on GPU process startup on Win/Mac.

content/gpu/gpu_child_thread.h

Index: content/gpu/gpu_child_thread.h
===================================================================
--- content/gpu/gpu_child_thread.h	(revision 137174)
+++ content/gpu/gpu_child_thread.h	(working copy)
@@ -34,8 +34,7 @@
 // commands to the GPU.
 class GpuChildThread : public ChildThread {
  public:
-  explicit GpuChildThread(bool dead_on_arrival,
-                          const content::GPUInfo& gpu_info);
+  GpuChildThread();
 
   // For single-process mode.
   explicit GpuChildThread(const std::string& channel_id);
@@ -67,9 +66,6 @@
                                const content::DxDiagNode& node);
 #endif
 
-  // Set this flag to true if a fatal error occurred before we receive the
-  // OnInitialize message, in which case we just declare ourselves DOA.
-  bool dead_on_arrival_;
   base::Time process_start_time_;
   scoped_refptr<GpuWatchdogThread> watchdog_thread_;