Reset the clipboard writer before destroying the clipboard message filter.

content/browser/renderer_host/clipboard_message_filter.cc

Index: content/browser/renderer_host/clipboard_message_filter.cc
diff --git a/content/browser/renderer_host/clipboard_message_filter.cc b/content/browser/renderer_host/clipboard_message_filter.cc
index 5cb0d9c83eec74145bc9698a2e197ccc0746eb0b..88e24d9736b858056dc2a12e6e1fa26859da5919 100644
--- a/content/browser/renderer_host/clipboard_message_filter.cc
+++ b/content/browser/renderer_host/clipboard_message_filter.cc
@@ -91,6 +91,7 @@ bool ClipboardMessageFilter::OnMessageReceived(const IPC::Message& message) {
 }
 
 ClipboardMessageFilter::~ClipboardMessageFilter() {
+  clipboard_writer_->Reset();

[Charlie Reis, 2015/03/10 03:28:47]

Hmm, how is this different than before?  clipboard_writer_ is a scoped_ptr and
the last member of the class, so it would be the first to be deleted.  What am I
missing?

[dcheng, 2015/03/10 03:36:02]

ScopedClipboardWriter flushes internal data to the clipboard when it is
destroyed. It also has a Reset() member function, which clears that internal
data (which turns ~ScopedClipboardWriter into a no-op).

We are calling SCW::Reset here, not scoped_ptr::reset (the naming collision is a
bit unfortunate).

 }
 
 void ClipboardMessageFilter::OnGetSequenceNumber(ui::ClipboardType type,