Move PageTransition into content namespace. While I'm touching all these files, I've also updated...

content/browser/tab_contents/render_view_host_manager.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 "content/browser/tab_contents/render_view_host_manager.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "content/browser/content_browser_client.h"
 #include "content/browser/renderer_host/render_view_host.h"
@@ skipping 390 matching lines @@
   //
   // If this navigation is generated, then it probably corresponds to a search
   // query.  Given that search results typically lead to users navigating to
   // other sites, we don't really want to use the search engine hostname to
   // determine the site instance for this navigation.
   //
   // NOTE: This can be removed once we have a way to transition between
   //       RenderViews in response to a link click.
   //
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kProcessPerSite) &&
-      entry.transition_type() == PageTransition::GENERATED)
+      entry.transition_type() == content::PAGE_TRANSITION_GENERATED)
     return curr_instance;
 
   // If we haven't used our SiteInstance (and thus RVH) yet, then we can use it
   // for this entry.  We won't commit the SiteInstance to this site until the
   // navigation commits (in DidNavigate), unless the navigation entry was
   // restored or it's a Web UI as described below.
   if (!curr_instance->has_site()) {
     // If we've already created a SiteInstance for our destination, we don't
     // want to use this unused SiteInstance; use the existing one.  (We don't
     // do this check if the curr_instance has a site, because for now, we want
@@ skipping 379 matching lines @@
   }
 }
 
 bool RenderViewHostManager::IsSwappedOut(RenderViewHost* rvh) {
   if (!rvh->site_instance())
     return false;
 
   return swapped_out_hosts_.find(rvh->site_instance()->id()) !=
       swapped_out_hosts_.end();
 }