Make backspace not go back while IME is active.

chrome/browser/ime_input.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef CHROME_BROWSER_IME_INPUT_H_
 #define CHROME_BROWSER_IME_INPUT_H_
 
 #include <windows.h>
 
 #include <string>
@@ skipping 75 matching lines @@
 //   recognizers (e.g. ViaVoice and Microsoft Office), etc.
 //   We can disable TSF and CUAS in Windows XP Tablet PC Edition. On the other
 //   hand, we can NEVER disable either TSF or CUAS in Windows Vista, i.e.
 //   THIS CLASS IS NOT ONLY USED ON THE INPUT CONTEXTS OF EAST-ASIAN
 //   LANGUAGES BUT ALSO USED ON THE INPUT CONTEXTS OF ALL LANGUAGES.
 class ImeInput {
  public:
   ImeInput();
   ~ImeInput();
 
-  // Retrieves whether or not there is an ongiong composition.
+  // Retrieves whether or not there is an ongoing composition.
   bool is_composing() const { return is_composing_; }
 
   // Retrieves the input language from Windows and update it.
   // Return values
   //   * true
   //     The given input language has IMEs.
   //   * false
   //     The given input language does not have IMEs.
   bool SetInputLanguage();
 
@@ skipping 190 matching lines @@
   //   * false: it does not create a system caret.
   bool system_caret_;
 
   // The rectangle of the input caret retrieved from a renderer process.
   gfx::Rect caret_rect_;
 
   DISALLOW_EVIL_CONSTRUCTORS(ImeInput);
 };
 
 #endif  // #ifndef CHROME_BROWSER_IME_INPUT_H_