Do not install document into hidden Window object, i.e. inner global Window.

Now we keep document in LocalDOMWindow, and do not have to keep it alive in hidden window object.

BUG=None

Review URL: https://codereview.chromium.org/1836193002

Cr-Commit-Position: refs/heads/master@{#383912}

third_party/WebKit/Source/bindings/core/v8/V8HiddenValue.h

@@ -33,7 +33,6 @@ class ScriptWrappable;
     V(condition) \
     V(data) \
     V(detail) \
-    V(document) \
     V(error) \
     V(event) \
     V(idbCursorRequest) \

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

@@ -431,11 +431,6 @@ void WindowProxy::updateDocumentProperty()
     // TODO(jochen): Don't replace the accessor with a data value. We need a way to tell v8 that the accessor's return value won't change after this point.
     if (!v8CallBoolean(context->Global()->ForceSet(context, v8AtomicString(m_isolate, "document"), documentWrapper, static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete))))
         return;
-
-    // We also stash a reference to the document on the inner global object so that
-    // LocalDOMWindow objects we obtain from JavaScript references are guaranteed to have
-    // live Document objects.
-    V8HiddenValue::setHiddenValue(m_scriptState.get(), toInnerGlobalObject(context), V8HiddenValue::document(m_isolate), documentWrapper);
 }
 
 void WindowProxy::updateActivityLogger()