Move ExtensionPrefs and friends to extensions/ directory.

Move ExtensionPrefs and related classes from
chrome/browser/extensions/ to the top-level extensions/
directory. The following classes are moved:

ExtensionPrefStore
ExtensionPrefValueMap
ExtensionPrefValueMapFactory
ExtensionPrefs
ExtensionPrefsFactory
ExtensionScopedPref

The TestExtensionPrefs helper class and the
ExtensionPrefsTest unit tests remain in
chrome/browser/extensions, since TestExtensionPrefs has a
dependency on Chrome's PrefServiceSyncable that seems like it
will be difficult to break (more explanation at
https://codereview.chromium.org/108643002/).

BUG=313284
[email protected],[email protected]

Review URL: https://codereview.chromium.org/46853004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246373 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 9007d16..0bb4081e 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -25,7 +25,6 @@
 #include "chrome/browser/extensions/activity_log/activity_log.h"
 #include "chrome/browser/extensions/api/commands/command_service.h"
 #include "chrome/browser/extensions/api/tabs/tabs_api.h"
-#include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_web_ui.h"
 #include "chrome/browser/extensions/external_component_loader.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
@@ -98,6 +97,7 @@
 #include "components/autofill/core/browser/autofill_manager.h"
 #include "components/user_prefs/pref_registry_syncable.h"
 #include "content/public/browser/render_process_host.h"
+#include "extensions/browser/extension_prefs.h"
 
 #if defined(ENABLE_AUTOFILL_DIALOG)
 #include "chrome/browser/ui/autofill/autofill_dialog_controller.h"