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

content/browser/download/download_state_info.h

Index: content/browser/download/download_state_info.h
===================================================================
--- content/browser/download/download_state_info.h	(revision 105162)
+++ content/browser/download/download_state_info.h	(working copy)
@@ -8,7 +8,7 @@
 
 #include "base/file_path.h"
 #include "content/common/content_export.h"
-#include "content/common/page_transition_types.h"
+#include "content/public/common/page_transition_types.h"
 
 // Contains information relating to the process of determining what to do with
 // the download.
@@ -19,7 +19,7 @@
   DownloadStateInfo(const FilePath& target,
                     const FilePath& forced_name,
                     bool has_user_gesture,
-                    PageTransition::Type transition_type,
+                    content::PageTransition transition_type,
                     bool prompt_user_for_save_location,
                     int uniquifier,
                     bool dangerous_file,
@@ -42,7 +42,7 @@
   // True if the download is the result of user action.
   bool has_user_gesture;
 
-  PageTransition::Type transition_type;
+  content::PageTransition transition_type;
 
   // True if we should display the 'save as...' UI and prompt the user
   // for the download location.