Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/ui/window_snapshot/window_snapshot.h

Index: chrome/browser/ui/window_snapshot/window_snapshot.h
diff --git a/chrome/browser/ui/window_snapshot/window_snapshot.h b/chrome/browser/ui/window_snapshot/window_snapshot.h
index 3259983cfcdd270b70c5e1404313ca6cf707c34f..406577003e6366b1af1162b083c0b6b517b9c17c 100644
--- a/chrome/browser/ui/window_snapshot/window_snapshot.h
+++ b/chrome/browser/ui/window_snapshot/window_snapshot.h
@@ -9,7 +9,7 @@
 
 #include "ui/gfx/native_widget_types.h"
 
-class PrefService;
+class PrefServiceSimple;
 
 namespace gfx {
 class Rect;
@@ -17,7 +17,7 @@ class Rect;
 
 namespace chrome {
 
-void RegisterScreenshotPrefs(PrefService* service);
+void RegisterScreenshotPrefs(PrefServiceSimple* service);
 
 // Grabs a snapshot of the rectangle area |snapshot_bounds| with respect to the
 // top left corner of the designated window and stores a PNG representation