Remove dead flush histograms code.

content/renderer/render_thread_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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 1421 matching lines @@
 
 int64_t RenderThreadImpl::GetIdleNotificationDelayInMs() const {
   return idle_notification_delay_in_ms_;
 }
 
 void RenderThreadImpl::SetIdleNotificationDelayInMs(
     int64_t idle_notification_delay_in_ms) {
   idle_notification_delay_in_ms_ = idle_notification_delay_in_ms;
 }
 
-void RenderThreadImpl::UpdateHistograms(int sequence_number) {
-  child_histogram_message_filter()->SendHistograms(sequence_number);
-}
-
 int RenderThreadImpl::PostTaskToAllWebWorkers(const base::Closure& closure) {
   return WorkerThreadRegistry::Instance()->PostTaskToAllThreads(closure);
 }
 
 bool RenderThreadImpl::ResolveProxy(const GURL& url, std::string* proxy_list) {
   bool result = false;
   Send(new ViewHostMsg_ResolveProxy(url, &result, proxy_list));
   return result;
 }
 
@@ skipping 1026 matching lines @@
   }
 }
 
 void RenderThreadImpl::OnRendererInterfaceRequest(
     mojom::RendererAssociatedRequest request) {
   DCHECK(!renderer_binding_.is_bound());
   renderer_binding_.Bind(std::move(request));
 }
 
 }  // namespace content