Fix keyboard shortcuts not working if a sad tab is focused.

content/browser/web_contents/web_contents_view_aura.cc

 // 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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/render_view_host_factory.h"
 #include "content/browser/web_contents/interstitial_page_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
@@ skipping 283 matching lines @@
   *out = window_->GetBoundsInRootWindow();
 }
 
 void WebContentsViewAura::SetPageTitle(const string16& title) {
   window_->set_title(title);
 }
 
 void WebContentsViewAura::OnTabCrashed(base::TerminationStatus status,
                                        int error_code) {
   view_ = NULL;
+  // Set the focus to the parent because neither the view window nor this
+  // window can handle key events.
+  if (window_->HasFocus() && window_->parent())
+    window_->parent()->Focus();
 }
 
 void WebContentsViewAura::SizeContents(const gfx::Size& size) {
   gfx::Rect bounds = window_->bounds();
   if (bounds.size() != size) {
     bounds.set_size(size);
     window_->SetBounds(bounds);
   } else {
     // Our size matches what we want but the renderers size may not match.
     // Pretend we were resized so that the renderers size is updated too.
@@ skipping 248 matching lines @@
 ui::TouchStatus WebContentsViewAura::OnTouchEvent(aura::TouchEvent* event) {
   return ui::TOUCH_STATUS_UNKNOWN;
 }
 
 ui::GestureStatus WebContentsViewAura::OnGestureEvent(
     aura::GestureEvent* event) {
   return ui::GESTURE_STATUS_UNKNOWN;
 }
 
 bool WebContentsViewAura::CanFocus() {
-  return true;
+  // Do not take the focus if |view_| is gone because neither the view window
+  // nor this window can handle key events.
+  return view_ != NULL;
 }
 
 void WebContentsViewAura::OnCaptureLost() {
 }
 
 void WebContentsViewAura::OnPaint(gfx::Canvas* canvas) {
 }
 
 void WebContentsViewAura::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
@@ skipping 69 matching lines @@
     OnDragEntered(event);
 
   web_contents_->GetRenderViewHost()->DragTargetDrop(
       event.location(),
       GetNativeView()->GetRootWindow()->last_mouse_location(),
       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
   if (drag_dest_delegate_)
     drag_dest_delegate_->OnDrop();
   return current_drag_op_;
 }