Set V8 extras mode in gin::V8Initializer.

content/renderer/render_process_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_process_impl.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 45 matching lines @@
   }
 
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kJavaScriptFlags)) {
     std::string flags(
         command_line.GetSwitchValueASCII(switches::kJavaScriptFlags));
     v8::V8::SetFlagsFromString(flags.c_str(), static_cast<int>(flags.size()));
   }
 
-  if (command_line.HasSwitch(
-          switches::kEnableExperimentalWebPlatformFeatures)) {
-    std::string extras_flag("--experimental_extras");
-    v8::V8::SetFlagsFromString(extras_flag.c_str(),
-                               static_cast<int>(extras_flag.size()));
-  }
-
   SiteIsolationStatsGatherer::SetEnabled(
       GetContentClient()->renderer()->ShouldGatherSiteIsolationStats());
 }
 
 RenderProcessImpl::~RenderProcessImpl() {
 #ifndef NDEBUG
   int count = blink::WebFrame::instanceCount();
   if (count)
     DLOG(ERROR) << "WebFrame LEAKED " << count << " TIMES";
 #endif
 
   GetShutDownEvent()->Signal();
 }
 
 void RenderProcessImpl::AddBindings(int bindings) {
   enabled_bindings_ |= bindings;
 }
 
 int RenderProcessImpl::GetEnabledBindings() const {
   return enabled_bindings_;
 }
 
 }  // namespace content