Make sure Backspace in a text field in an infobar does not navigate back one page.

chrome/browser/ui/views/extensions/extension_view.cc

 // Copyright (c) 2011 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/views/extensions/extension_view.h"
 
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/ui/views/extensions/extension_popup.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/renderer_host/render_widget_host_view.h"
@@ skipping 154 matching lines @@
 }
 
 void ExtensionView::PreferredSizeChanged() {
   View::PreferredSizeChanged();
   if (container_)
     container_->OnExtensionPreferredSizeChanged(this);
 }
 
 bool ExtensionView::SkipDefaultKeyEventProcessing(const views::KeyEvent& e) {
   // Let the tab key event be processed by the renderer (instead of moving the
-  // focus to the next focusable view).
-  return (e.key_code() == ui::VKEY_TAB);
+  // focus to the next focusable view). Also handle Backspace, since otherwise
+  // (on Windows at least), pressing Backspace, when focus is on a text field
+  // within the ExtensionView, will navigate the page back instead of erasing a
+  // character.
+  return (e.key_code() == ui::VKEY_TAB || e.key_code() == ui::VKEY_BACK);
 }
 
 void ExtensionView::OnBoundsChanged(const gfx::Rect& previous_bounds) {
   // Propagate the new size to RenderWidgetHostView.
   // We can't send size zero because RenderWidget DCHECKs that.
   if (render_view_host()->view() && !bounds().IsEmpty())
     render_view_host()->view()->SetSize(size());
 }
 
 void ExtensionView::HandleMouseMove() {
@@ skipping 11 matching lines @@
     render_view_host()->view()->SetBackground(pending_background_);
     pending_background_.reset();
   }
 
   // Tell the renderer not to draw scroll bars in popups unless the
   // popups are at the maximum allowed size.
   gfx::Size largest_popup_size(ExtensionPopup::kMaxWidth,
                                ExtensionPopup::kMaxHeight);
   host_->DisableScrollbarsForSmallWindows(largest_popup_size);
 }