binding: Changes failing CHECKs to DCHECKs.

third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 102 matching lines @@
     frame->loader().client()->willReleaseScriptContext(context,
                                                        m_world->worldId());
     MainThreadDebugger::instance()->contextWillBeDestroyed(m_scriptState.get());
   }
 
   m_document.clear();
 
   if (behavior == DetachGlobal) {
     // Clean up state on the global proxy, which will be reused.
     if (!m_globalProxy.isEmpty()) {
-      CHECK(m_globalProxy == context->Global());
-      CHECK_EQ(toScriptWrappable(context->Global()),
-               toScriptWrappable(
-                   context->Global()->GetPrototype().As<v8::Object>()));
+      // TODO(yukishiino): This DCHECK failed on Canary (M57) and Dev (M56).
+      // We need to figure out why m_globalProxy != context->Global().
+      DCHECK(m_globalProxy == context->Global());
+      DCHECK_EQ(toScriptWrappable(context->Global()),
+                toScriptWrappable(
+                    context->Global()->GetPrototype().As<v8::Object>()));
       m_globalProxy.get().SetWrapperClassId(0);
     }
     V8DOMWrapper::clearNativeInfo(m_isolate, context->Global());
     m_scriptState->detachGlobalObject();
   }
 
   m_scriptState->disposePerContextData();
 
   // It's likely that disposing the context has created a lot of
   // garbage. Notify V8 about this so it'll have a chance of cleaning
@@ skipping 462 matching lines @@
                          v8String(m_isolate, name));
 }
 
 void WindowProxy::updateSecurityOrigin(SecurityOrigin* origin) {
   if (!isContextInitialized())
     return;
   setSecurityToken(origin);
 }
 
 }  // namespace blink