Fix renderer crashes when frame gets detached while injectng user scripts.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 9d413a1658424cbf7e5148a4861730ed64f1c3a7..9960d3d8ce4b72e8b284b66c5d819a7f0f7f3f76 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -3698,7 +3698,8 @@ void RenderViewImpl::didFinishDocumentLoad(WebFrame* frame) {
                     DidFinishDocumentLoad(frame));
 
   // Check whether we have new encoding name.
-  UpdateEncoding(frame, frame->view()->pageEncoding().utf8());
+  if (frame->view())

[dcheng, 2014/02/07 16:53:37]

Might be good to add a comment on why you need to check this, e.g.
// RenderViewObservers can run Javascript that removes |frame| so it may no
longer have a view.

+    UpdateEncoding(frame, frame->view()->pageEncoding().utf8());
 }
 
 void RenderViewImpl::didHandleOnloadEvents(WebFrame* frame) {