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

chrome/browser/ui/webui/html_dialog_tab_contents_delegate.h

Index: chrome/browser/ui/webui/html_dialog_tab_contents_delegate.h
===================================================================
--- chrome/browser/ui/webui/html_dialog_tab_contents_delegate.h	(revision 105162)
+++ chrome/browser/ui/webui/html_dialog_tab_contents_delegate.h	(working copy)
@@ -36,12 +36,13 @@
 
   // Deprecated. Use two-arguments variant instead.
   // TODO(adriansc): Remove this method once refactoring changed all call sites.
+  virtual TabContents* OpenURLFromTab(
+      TabContents* source,
+      const GURL& url,
+      const GURL& referrer,
+      WindowOpenDisposition disposition,
+      content::PageTransition transition) OVERRIDE;
   virtual TabContents* OpenURLFromTab(TabContents* source,
-                                      const GURL& url,
-                                      const GURL& referrer,
-                                      WindowOpenDisposition disposition,
-                                      PageTransition::Type transition) OVERRIDE;
-  virtual TabContents* OpenURLFromTab(TabContents* source,
                                       const OpenURLParams& params) OVERRIDE;
 
   virtual void AddNewContents(TabContents* source,