Move prefs-related files under chrome/browser/ into a prefs/ subdir.

Rename includes, resort header include order in places where the rename
changed the order.

BUG=50548
TEST=compiles

Review URL: http://codereview.chromium.org/3203008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57434 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/automation/automation_provider.cc b/chrome/browser/automation/automation_provider.cc
index 3dc91aba..eee8fbb 100644
--- a/chrome/browser/automation/automation_provider.cc
+++ b/chrome/browser/automation/automation_provider.cc
@@ -75,7 +75,7 @@
 #include "chrome/browser/login_prompt.h"
 #include "chrome/browser/net/url_request_mock_util.h"
 #include "chrome/browser/platform_util.h"
-#include "chrome/browser/pref_service.h"
+#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/printing/print_job.h"
 #include "chrome/browser/profile_manager.h"
 #include "chrome/browser/renderer_host/render_process_host.h"