Merge 94102 - [Chromium] Add null checks for document()->loader()

Source/WebKit/chromium/src/WebViewImpl.cpp

 /*
  * Copyright (C) 2010 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 1610 matching lines @@
         m_webSettings = adoptPtr(new WebSettingsImpl(m_page->settings()));
     ASSERT(m_webSettings.get());
     return m_webSettings.get();
 }
 
 WebString WebViewImpl::pageEncoding() const
 {
     if (!m_page.get())
         return WebString();
 
+    if (!m_page->mainFrame()->document()->loader())
+        return WebString();
+
     return m_page->mainFrame()->document()->loader()->writer()->encoding();
 }
 
 void WebViewImpl::setPageEncoding(const WebString& encodingName)
 {
     if (!m_page.get())
         return;
 
     // Only change override encoding, don't change default encoding.
     // Note that the new encoding must be 0 if it isn't supposed to be set.
@@ skipping 1029 matching lines @@
     m_page->setVisibilityState(static_cast<PageVisibilityState>(static_cast<int>(visibilityState)), isInitialState);
 #endif
 
 #if USE(ACCELERATED_COMPOSITING)
     if (isAcceleratedCompositingActive() && visibilityState == WebPageVisibilityStateHidden)
         m_layerRenderer->releaseTextures();
 #endif
 }
 
 } // namespace WebKit