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

chrome/browser/rlz/rlz_unittest.cc

Index: chrome/browser/rlz/rlz_unittest.cc
===================================================================
--- chrome/browser/rlz/rlz_unittest.cc	(revision 105162)
+++ chrome/browser/rlz/rlz_unittest.cc	(working copy)
@@ -206,7 +206,7 @@
 
 void RlzLibTest::SimulateHomepageUsage() {
   NavigationEntry entry(NULL, 0, GURL(), GURL(), string16(),
-                        PageTransition::HOME_PAGE);
+                        content::PAGE_TRANSITION_HOME_PAGE);
   tracker_.Observe(content::NOTIFICATION_NAV_ENTRY_PENDING,
                    NotificationService::AllSources(),
                    Details<NavigationEntry>(&entry));
@@ -541,7 +541,7 @@
 
 TEST_F(RlzLibTest, ObserveHandlesBadArgs) {
   NavigationEntry entry(NULL, 0, GURL(), GURL(), string16(),
-                        PageTransition::LINK);
+                        content::PAGE_TRANSITION_LINK);
   tracker_.Observe(content::NOTIFICATION_NAV_ENTRY_PENDING,
                    NotificationService::AllSources(),
                    Details<NavigationEntry>(NULL));