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

chrome/browser/ui/webui/print_preview_handler.cc

Index: chrome/browser/ui/webui/print_preview_handler.cc
===================================================================
--- chrome/browser/ui/webui/print_preview_handler.cc	(revision 105162)
+++ chrome/browser/ui/webui/print_preview_handler.cc	(working copy)
@@ -870,7 +870,7 @@
                    GetCloudPrintServiceManageURL(),
                    GURL(),
                    NEW_FOREGROUND_TAB,
-                   PageTransition::LINK);
+                   content::PAGE_TRANSITION_LINK);
 }
 
 void PrintPreviewHandler::HandleShowSystemDialog(const ListValue* /*args*/) {
@@ -906,7 +906,7 @@
 
   TabContents* contents = initiator_tab->tab_contents();
   contents->OpenURL(contents->GetURL(), GURL(), CURRENT_TAB,
-                    PageTransition::RELOAD);
+                    content::PAGE_TRANSITION_RELOAD);
   ActivateInitiatorTabAndClosePreviewTab();
 }