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

chrome/browser/ui/panels/panel_browser_window_cocoa_unittest.mm

 // 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.
 
 #import "chrome/browser/ui/panels/panel_browser_window_cocoa.h"
 
 #include <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
@@ skipping 45 matching lines @@
     PanelManager* manager = PanelManager::GetInstance();
     int panels_count = manager->num_panels();
 
     Browser* panel_browser = Browser::CreateForApp(Browser::TYPE_PANEL,
                                                    panel_name,
                                                    gfx::Rect(),
                                                    profile());
 
     TabContentsWrapper* tab_contents = new TabContentsWrapper(
         new TestTabContents(profile(), NULL));
-    panel_browser->AddTab(tab_contents, PageTransition::LINK);
+    panel_browser->AddTab(tab_contents, content::PAGE_TRANSITION_LINK);
 
     // We just created one new panel.
     EXPECT_EQ(panels_count + 1, manager->num_panels());
 
     Panel* panel = static_cast<Panel*>(panel_browser->window());
     EXPECT_TRUE(panel);
     EXPECT_TRUE(panel->native_panel());  // Native panel is created right away.
     PanelBrowserWindowCocoa* native_window =
         static_cast<PanelBrowserWindowCocoa*>(panel->native_panel());
     EXPECT_EQ(panel, native_window->panel_);  // Back pointer initialized.
@@ skipping 319 matching lines @@
   NSWindow* frontmostWindow = [[NSApp orderedWindows] objectAtIndex:0];
   EXPECT_NSEQ(frontmostWindow, [native_window->controller_ window]);
 
   native_window2->ActivatePanel();
   frontmostWindow = [[NSApp orderedWindows] objectAtIndex:0];
   EXPECT_NSEQ(frontmostWindow, [native_window2->controller_ window]);
 
   ClosePanelAndWait(panel->browser());
   ClosePanelAndWait(panel2->browser());
 }