Delete orphaned uma metric MPArch.RWH_DidUpdateBackingStore.

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 
 #include <set>
 #include <tuple>
@@ skipping 1977 matching lines @@
   // support asynchronous painting, this is equivalent to
   // MPArch.RWH_TotalPaintTime.
   TimeDelta delta = TimeTicks::Now() - paint_start;
   UMA_HISTOGRAM_TIMES("MPArch.RWH_OnMsgUpdateRect", delta);
 }
 
 void RenderWidgetHostImpl::DidUpdateBackingStore(
     const ViewHostMsg_UpdateRect_Params& params,
     const TimeTicks& paint_start) {
   TRACE_EVENT0("renderer_host", "RenderWidgetHostImpl::DidUpdateBackingStore");
-  TimeTicks update_start = TimeTicks::Now();
 
   NotificationService::current()->Notify(
       NOTIFICATION_RENDER_WIDGET_HOST_DID_UPDATE_BACKING_STORE,
       Source<RenderWidgetHost>(this),
       NotificationService::NoDetails());
 
   // We don't need to update the view if the view is hidden. We must do this
   // early return after the ACK is sent, however, or the renderer will not send
   // us more data.
   if (is_hidden_)
     return;
 
   // If we got a resize ack, then perhaps we have another resize to send?
   bool is_resize_ack =
       ViewHostMsg_UpdateRect_Flags::is_resize_ack(params.flags);
   if (is_resize_ack)
     WasResized();
-
-  // Log the time delta for processing a paint message.
-  TimeTicks now = TimeTicks::Now();
-  TimeDelta delta = now - update_start;
-  UMA_HISTOGRAM_TIMES("MPArch.RWH_DidUpdateBackingStore", delta);
 }
 
 void RenderWidgetHostImpl::OnQueueSyntheticGesture(
     const SyntheticGesturePacket& gesture_packet) {
   // Only allow untrustworthy gestures if explicitly enabled.
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
           cc::switches::kEnableGpuBenchmarking)) {
     bad_message::ReceivedBadMessage(GetProcess(),
                                     bad_message::RWH_SYNTHETIC_GESTURE);
     return;
@@ skipping 626 matching lines @@
   RenderProcessHost* rph = GetProcess();
   for (std::vector<IPC::Message>::const_iterator i = messages.begin();
        i != messages.end(); ++i) {
     rph->OnMessageReceived(*i);
     if (i->dispatch_error())
       rph->OnBadMessageReceived(*i);
   }
 }
 
 }  // namespace content