An experimental fix for Issue 7707....

chrome/views/focus_manager.cc

 // 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.
 
 #include <algorithm>
 
 #include "base/histogram.h"
 #include "base/logging.h"
 #include "base/win_util.h"
 #include "chrome/browser/renderer_host/render_widget_host_view_win.h"
@@ skipping 173 matching lines @@
                                         wParam, lParam);
         if (!focus_manager->OnPostActivate(window,
                                            LOWORD(wParam), HIWORD(wParam)))
           return 0;
         return result;
       }
       case WM_MOUSEWHEEL:
         if (RerouteMouseWheel(window, wParam, lParam))
           return 0;
         break;
+      case WM_IME_CHAR:
+        // Issue 7707: A rich-edit control may crash when it receives a
+        // WM_IME_CHAR message while it is processing a WM_IME_COMPOSITION
+        // message. Since view controls don't need WM_IME_CHAR messages,
+        // we prevent WM_IME_CHAR messages from being dispatched to view
+        // controls via the CallWindowProc() call.
+        return 0;
       default:
         break;
     }
   }
   return CallWindowProc(original_handler, window, message, wParam, lParam);
 }
 
 // FocusManager -----------------------------------------------------
 
 // static
@@ skipping 632 matching lines @@
                 listener);
   if (place == focus_change_listeners_.end()) {
     NOTREACHED() << "Removing a listener that isn't registered.";
     return;
   }
   focus_change_listeners_.erase(place);
 }
 
 }  // namespace views