Fixing ESC in instant-extended.

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
 
 #include <Carbon/Carbon.h>  // kVK_Return
 
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
@@ skipping 504 matching lines @@
     } else {
       NOTREACHED();
       color = BaseTextColor();
     }
     [as addAttribute:NSForegroundColorAttributeName value:color
                range:ComponentToNSRange(scheme)];
   }
 }
 
 void OmniboxViewMac::OnTemporaryTextMaybeChanged(const string16& display_text,
-                                                 bool save_original_selection) {
+                                                 bool save_original_selection,
+                                                 bool notify_text_changed) {
   if (save_original_selection)
     saved_temporary_selection_ = GetSelectedRange();
 
   suggest_text_length_ = 0;
   SetWindowTextAndCaretPos(display_text, display_text.size(), false, false);
-  model()->OnChanged();
+  if (notify_text_changed)
+    model()->OnChanged();
   [field_ clearUndoChain];
 }
 
 void OmniboxViewMac::OnStartingIME() {
   // Reset the suggest text just before starting an IME composition session,
   // otherwise the IME composition may be interrupted when the suggest text
   // gets reset by the IME composition change.
   SetInstantSuggestion(string16());
 }
 
@@ skipping 496 matching lines @@
 NSUInteger OmniboxViewMac::GetTextLength() const {
   return ([field_ currentEditor] ?
           [[[field_ currentEditor] string] length] :
           [[field_ stringValue] length]) - suggest_text_length_;
 }
 
 bool OmniboxViewMac::IsCaretAtEnd() const {
   const NSRange selection = GetSelectedRange();
   return selection.length == 0 && selection.location == GetTextLength();
 }