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

chrome/browser/autocomplete/autocomplete_browsertest.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 "base/format_macros.h"
 #include "base/path_service.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete.h"
 #include "chrome/browser/autocomplete/autocomplete_edit.h"
@@ skipping 134 matching lines @@
   // http://code.google.com/p/chromium/issues/detail?id=38385
   // Make sure that tabbing away from an empty omnibar causes a revert
   // and select all.
   LocationBar* location_bar = GetLocationBar();
   EXPECT_EQ(UTF8ToUTF16(chrome::kAboutBlankURL),
             location_bar->location_entry()->GetText());
   location_bar->location_entry()->SetUserText(string16());
   ui_test_utils::WindowedNotificationObserver observer(
       content::NOTIFICATION_LOAD_STOP, NotificationService::AllSources());
   browser()->AddSelectedTabWithURL(GURL(chrome::kAboutBlankURL),
-                                   PageTransition::START_PAGE);
+                                   content::PAGE_TRANSITION_START_PAGE);
   observer.Wait();
   EXPECT_EQ(UTF8ToUTF16(chrome::kAboutBlankURL),
             location_bar->location_entry()->GetText());
   browser()->CloseTab();
   EXPECT_EQ(UTF8ToUTF16(chrome::kAboutBlankURL),
             location_bar->location_entry()->GetText());
   EXPECT_TRUE(location_bar->location_entry()->IsSelectAll());
 }
 
 IN_PROC_BROWSER_TEST_F(AutocompleteBrowserTest, FocusSearch) {
@@ skipping 146 matching lines @@
     const AutocompleteResult& result = autocomplete_controller->result();
     // 'App test' is also a substring of extension 'Packaged App Test'.
     EXPECT_GT(result.size(), 2U) << AutocompleteResultAsString(result);
     AutocompleteMatch match = result.match_at(0);
     EXPECT_EQ(ASCIIToUTF16("App Test"), match.contents);
     EXPECT_EQ(AutocompleteMatch::EXTENSION_APP, match.type);
     EXPECT_FALSE(match.deletable);
     location_bar->AcceptInput();
   }
 }