Make sure gin Handles exist before using them

content/renderer/memory_benchmarking_extension.cc

 // Copyright (c) 2013 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/memory_benchmarking_extension.h"
 
 #include "content/common/memory_benchmark_messages.h"
 #include "content/renderer/render_thread_impl.h"
 #include "gin/arguments.h"
 #include "gin/handle.h"
@@ skipping 14 matching lines @@
 void MemoryBenchmarkingExtension::Install(blink::WebFrame* frame) {
   v8::Isolate* isolate = blink::mainThreadIsolate();
   v8::HandleScope handle_scope(isolate);
   v8::Handle<v8::Context> context = frame->mainWorldScriptContext();
   if (context.IsEmpty())
     return;
 
   v8::Context::Scope context_scope(context);
   gin::Handle<MemoryBenchmarkingExtension> controller =
       gin::CreateHandle(isolate, new MemoryBenchmarkingExtension());
+  if (controller.IsEmpty())
+    return;
+
   v8::Handle<v8::Object> global = context->Global();
   v8::Handle<v8::Object> chrome =
       global->Get(gin::StringToV8(isolate, "chrome"))->ToObject();
   if (chrome.IsEmpty()) {
     chrome = v8::Object::New(isolate);
     global->Set(gin::StringToV8(isolate, "chrome"), chrome);
   }
   chrome->Set(gin::StringToV8(isolate, "memoryBenchmarking"),
               controller.ToV8());
 }
@@ skipping 34 matching lines @@
   if (process_type == "browser") {
     content::RenderThreadImpl::current()->Send(
         new MemoryBenchmarkHostMsg_HeapProfilerDump(reason));
   } else {
     ::HeapProfilerDump(reason.c_str());
   }
 #endif
 }
 
 }  // namespace content