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

chrome/browser/ui/views/sad_tab_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/sad_tab_view.h"
 
 #include "base/metrics/histogram.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 45 matching lines @@
 }
 
 SadTabView::~SadTabView() {}
 
 void SadTabView::LinkClicked(views::Link* source, int event_flags) {
   if (tab_contents_ != NULL && source == help_link_) {
     GURL help_url =
         google_util::AppendGoogleLocaleParam(GURL(kind_ == CRASHED ?
                                                   chrome::kCrashReasonURL :
                                                   chrome::kKillReasonURL));
-    tab_contents_->OpenURL(help_url, GURL(), CURRENT_TAB, PageTransition::LINK);
+    tab_contents_->OpenURL(
+        help_url, GURL(), CURRENT_TAB, content::PAGE_TRANSITION_LINK);
   } else if (tab_contents_ != NULL && source == feedback_link_) {
     browser::ShowHtmlBugReportView(
         Browser::GetBrowserForController(&tab_contents_->controller(), NULL),
         l10n_util::GetStringUTF8(IDS_KILLED_TAB_FEEDBACK_MESSAGE),
         userfeedback::ChromeOsData_ChromeOsCategory_CRASH);
   }
 }
 
 void SadTabView::Layout() {
   // Specify the maximum message width explicitly.
@@ skipping 90 matching lines @@
 }
 
 void SadTabView::OnPaint(gfx::Canvas* canvas) {
   if (!painted_) {
     // User actually saw the error, keep track for user experience stats.
     UMA_HISTOGRAM_COUNTS("SadTab.Displayed", kind_);
     painted_ = true;
   }
   View::OnPaint(canvas);
 }