Make panel adjust bounds per preferred size change notification on Windows.

content/browser/tab_contents/tab_contents_delegate.cc

Index: content/browser/tab_contents/tab_contents_delegate.cc
===================================================================
--- content/browser/tab_contents/tab_contents_delegate.cc	(revision 96104)
+++ content/browser/tab_contents/tab_contents_delegate.cc	(working copy)
@@ -280,6 +280,9 @@
   return JavaScriptDialogCreatorStub::GetInstance();
 }
 
+void TabContentsDelegate::UpdatePreferredSize(const gfx::Size& pref_size) {
+}
+
 TabContentsDelegate::~TabContentsDelegate() {
   while (!attached_contents_.empty()) {
     TabContents* tab_contents = *attached_contents_.begin();