Move asserts for tracking global object detachment to WindowProxy.

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

Index: third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
index d582360d44a27884e0f1d7ec3b5239a506f1e32d..4fc6b1c28a2aadef9ab8fdd8a8b3d2505fa3f9cb 100644
--- a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
@@ -80,10 +80,11 @@ v8::Local<v8::Object> WindowProxy::globalIfNotDetached() {
 
 v8::Local<v8::Object> WindowProxy::releaseGlobal() {
   DCHECK(m_lifecycle != Lifecycle::ContextInitialized);
+
   // Make sure the global object was detached from the proxy by calling
   // clearForNavigation().
-  if (m_lifecycle == Lifecycle::ContextDetached)
-    ASSERT(m_scriptState->isGlobalObjectDetached());
+  DLOG_IF(FATAL, m_isGlobalProxyAttached)
+      << "Context not detached by calling clearForNavigation()";
 
   v8::Local<v8::Object> global = m_globalProxy.newLocal(m_isolate);
   m_globalProxy.clear();