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

chrome/browser/history/expire_history_backend_unittest.cc

Index: chrome/browser/history/expire_history_backend_unittest.cc
===================================================================
--- chrome/browser/history/expire_history_backend_unittest.cc	(revision 105162)
+++ chrome/browser/history/expire_history_backend_unittest.cc	(working copy)
@@ -255,7 +255,7 @@
   visit_row3.url_id = url_ids[1];
   visit_row3.visit_time = visit_times[2];
   visit_row3.is_indexed = true;
-  visit_row3.transition = PageTransition::TYPED;
+  visit_row3.transition = content::PAGE_TRANSITION_TYPED;
   main_db_->AddVisit(&visit_row3, SOURCE_BROWSED);
 
   VisitRow visit_row4;
@@ -297,18 +297,19 @@
 
   // Four times for each visit.
   VisitRow visit_row1(url_id, last_visit_time - TimeDelta::FromDays(4), 0,
-                      PageTransition::TYPED, 0);
+                      content::PAGE_TRANSITION_TYPED, 0);
   main_db_->AddVisit(&visit_row1, SOURCE_SYNCED);
 
   VisitRow visit_row2(url_id, last_visit_time - TimeDelta::FromDays(3), 0,
-                      PageTransition::TYPED, 0);
+                      content::PAGE_TRANSITION_TYPED, 0);
   main_db_->AddVisit(&visit_row2, SOURCE_BROWSED);
 
   VisitRow visit_row3(url_id, last_visit_time - TimeDelta::FromDays(2), 0,
-                      PageTransition::TYPED, 0);
+                      content::PAGE_TRANSITION_TYPED, 0);
   main_db_->AddVisit(&visit_row3, SOURCE_EXTENSION);
 
-  VisitRow visit_row4(url_id, last_visit_time, 0, PageTransition::TYPED, 0);
+  VisitRow visit_row4(
+      url_id, last_visit_time, 0, content::PAGE_TRANSITION_TYPED, 0);
   main_db_->AddVisit(&visit_row4, SOURCE_FIREFOX_IMPORTED);
 }