Revert 52600 - renderer_host: Remove CanBlur method....

chrome/browser/renderer_host/render_widget_host_view_gtk.cc

 // Copyright (c) 2010 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/render_widget_host_view_gtk.h"
 
 // If this gets included after the gtk headers, then a bunch of compiler
 // errors happen because of a "#define Status int" in Xlib.h, which interacts
 // badly with URLRequestStatus::Status.
 #include "chrome/common/render_messages.h"
@@ skipping 585 matching lines @@
   }
 }
 
 void RenderWidgetHostViewGtk::Focus() {
   gtk_widget_grab_focus(view_.get());
 }
 
 void RenderWidgetHostViewGtk::Blur() {
   // TODO(estade): We should be clearing native focus as well, but I know of no
   // way to do that without focusing another widget.
-  host_->Blur();
+  // TODO(estade): it doesn't seem like the CanBlur() check should be necessary
+  // since we are only called in response to a ViewHost blur message, but this
+  // check is made on Windows so I've added it here as well.
+  if (host_->CanBlur())
+    host_->Blur();
 }
 
 bool RenderWidgetHostViewGtk::HasFocus() {
   return gtk_widget_is_focus(view_.get());
 }
 
 void RenderWidgetHostViewGtk::Show() {
   gtk_widget_show(view_.get());
 }
 
@@ skipping 360 matching lines @@
 }
 
 // static
 RenderWidgetHostView*
     RenderWidgetHostView::GetRenderWidgetHostViewFromNativeView(
         gfx::NativeView widget) {
   gpointer user_data = g_object_get_data(G_OBJECT(widget),
                                          kRenderWidgetHostViewKey);
   return reinterpret_cast<RenderWidgetHostView*>(user_data);
 }