Fix client-side phishing detection test flakiness and ChromeOS failure.

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 3f6756a1e183fd40a2b3a3c3cc1522d27985fa6b..d1ed17d78450ca448ef104ee6d2263862b09aea0 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -472,7 +472,7 @@ void RenderThreadImpl::EnsureWebKitInitialized() {
   v8::V8::SetCreateHistogramFunction(CreateHistogram);
   v8::V8::SetAddHistogramSampleFunction(AddHistogramSample);
 
-  webkit_platform_support_.reset(new RendererWebKitPlatformSupportImpl);
+  webkit_platform_support_.reset(CreateWebKitPlatformSupport());
   WebKit::initialize(webkit_platform_support_.get());
 
   bool has_enable = CommandLine::ForCurrentProcess()->HasSwitch(
@@ -824,6 +824,11 @@ void RenderThreadImpl::OnSetZoomLevelForCurrentURL(const std::string& host,
   content::RenderView::ForEach(&zoomer);
 }
 
+RendererWebKitPlatformSupportImpl*
+RenderThreadImpl::CreateWebKitPlatformSupport() {
+  return new RendererWebKitPlatformSupportImpl;
+}
+
 bool RenderThreadImpl::OnControlMessageReceived(const IPC::Message& msg) {
   ObserverListBase<RenderProcessObserver>::Iterator it(observers_);
   RenderProcessObserver* observer;