Fix issue 20297: Typing backspace while in a form field causes the browser to...

chrome/browser/renderer_host/gtk_im_context_wrapper.cc

 // Copyright (c) 2009 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/renderer_host/gtk_im_context_wrapper.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
@@ skipping 269 matching lines @@
   if (!NeedCommitByForwardingCharEvent()) {
     wke->windowsKeyCode = kCompositionEventKeyCode;
     // keyidentifier must be updated accordingly, otherwise this key event may
     // still be processed by webkit.
     wke->setKeyIdentifierFromWindowsKeyCode();
     // Prevent RenderView::UnhandledKeyboardEvent() from processing it.
     // Otherwise unexpected result may occur. For example if it's a
     // Backspace key event, the browser may go back to previous page.
     if (wke->os_event) {
       wke->os_event->keyval = GDK_VoidSymbol;
+      wke->os_event->hardware_keycode = 0;
       wke->os_event->state = 0;
     }
   }
   host_view_->GetRenderWidgetHost()->ForwardKeyboardEvent(*wke);
 }
 
 void GtkIMContextWrapper::ProcessUnfilteredKeyPressEvent(
     NativeWebKeyboardEvent* wke) {
   RenderWidgetHost* host = host_view_->GetRenderWidgetHost();
 
@@ skipping 209 matching lines @@
 
 void GtkIMContextWrapper::HandleHostViewRealizeThunk(
     GtkWidget* widget, GtkIMContextWrapper* self) {
   self->HandleHostViewRealize(widget);
 }
 
 void GtkIMContextWrapper::HandleHostViewUnrealizeThunk(
     GtkWidget* widget, GtkIMContextWrapper* self) {
   self->HandleHostViewUnrealize();
 }