Update V8 histogram/counter API usage

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index c7ea9c71e78c6fcd3727d6326465f816285e075e..266663abec226897c32c3ffb185f8cda61d84067 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -331,7 +331,7 @@ void RenderThreadImpl::HistogramCustomizer::SetCommonHost(
   if (host != common_host_) {
     common_host_ = host;
     common_host_histogram_suffix_ = HostToCustomHistogramSuffix(host);
-    v8::V8::SetCreateHistogramFunction(CreateHistogram);
+    blink::mainThreadIsolate()->SetCreateHistogramFunction(CreateHistogram);
   }
 }
 
@@ -357,10 +357,6 @@ void RenderThreadImpl::Init() {
       base::PlatformThread::CurrentId(),
       kTraceEventRendererMainThreadSortIndex);
 
-  v8::V8::SetCounterFunction(base::StatsTable::FindLocation);
-  v8::V8::SetCreateHistogramFunction(CreateHistogram);
-  v8::V8::SetAddHistogramSampleFunction(AddHistogramSample);
-
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
   // On Mac and Android, the select popups are rendered by the browser.
   blink::WebView::setUseExternalPopupMenus(true);
@@ -791,6 +787,12 @@ void RenderThreadImpl::EnsureWebKitInitialized() {
   webkit_platform_support_.reset(new RendererWebKitPlatformSupportImpl);
   blink::initialize(webkit_platform_support_.get());
 
+  v8::Isolate* isolate = blink::mainThreadIsolate();
+
+  isolate->SetCounterFunction(base::StatsTable::FindLocation);
+  isolate->SetCreateHistogramFunction(CreateHistogram);
+  isolate->SetAddHistogramSampleFunction(AddHistogramSample);
+
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 
   bool enable = command_line.HasSwitch(switches::kEnableThreadedCompositing);