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

chrome/browser/download/chrome_download_manager_delegate.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/download/chrome_download_manager_delegate.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/file_util.h"
@@ skipping 481 matching lines @@
 }
 
 // TODO(phajdan.jr): This is apparently not being exercised in tests.
 bool ChromeDownloadManagerDelegate::IsDangerousFile(
     const DownloadItem& download,
     const DownloadStateInfo& state,
     bool visited_referrer_before) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   // Anything loaded directly from the address bar is OK.
-  if (state.transition_type & PageTransition::FROM_ADDRESS_BAR)
+  if (state.transition_type & content::PAGE_TRANSITION_FROM_ADDRESS_BAR)
     return false;
 
   // Extensions that are not from the gallery are considered dangerous.
   if (IsExtensionDownload(&download)) {
     ExtensionService* service = profile_->GetExtensionService();
     if (!service || !service->IsDownloadFromGallery(download.GetURL(),
                                                     download.referrer_url()))
       return true;
   }
 
@@ skipping 27 matching lines @@
 // TODO(noelutz): This function currently works as a callback place holder.
 // Once we decide the hash check is reliable, we could move the
 // MaybeCompleteDownload in OnAllDataSaved to this function.
 void ChromeDownloadManagerDelegate::CheckDownloadHashDone(
     int32 download_id,
     bool is_dangerous_hash) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DVLOG(1) << "CheckDownloadHashDone, download_id: " << download_id
            << " is dangerous_hash: " << is_dangerous_hash;
 }