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

content/browser/renderer_host/resource_queue_unittest.cc

Index: content/browser/renderer_host/resource_queue_unittest.cc
===================================================================
--- content/browser/renderer_host/resource_queue_unittest.cc	(revision 105162)
+++ content/browser/renderer_host/resource_queue_unittest.cc	(working copy)
@@ -23,8 +23,9 @@
 ResourceDispatcherHostRequestInfo* GetRequestInfo(int request_id) {
   return new ResourceDispatcherHostRequestInfo(
       new DummyResourceHandler(), ChildProcessInfo::RENDER_PROCESS, 0, 0, 0,
-      request_id, false, -1, ResourceType::MAIN_FRAME, PageTransition::LINK, 0,
-      false, false, false, content::MockResourceContext::GetInstance());
+      request_id, false, -1, ResourceType::MAIN_FRAME,
+      content::PAGE_TRANSITION_LINK, 0, false, false, false,
+      content::MockResourceContext::GetInstance());
 }
 
 void InitializeQueue(ResourceQueue* queue, ResourceQueueDelegate* delegate) {