Move remaining non-test, non-Chrome-specific Prefs code to base/prefs/.

chrome/browser/pepper_flash_settings_manager.cc

Index: chrome/browser/pepper_flash_settings_manager.cc
diff --git a/chrome/browser/pepper_flash_settings_manager.cc b/chrome/browser/pepper_flash_settings_manager.cc
index b9aaac6ce76065f9a380b7043b1f6bc5b7666932..2c1a1bd40cd0b8f3171d43ed19ce4deaf2578ecb 100644
--- a/chrome/browser/pepper_flash_settings_manager.cc
+++ b/chrome/browser/pepper_flash_settings_manager.cc
@@ -10,11 +10,11 @@
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
+#include "base/prefs/pref_service.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "chrome/browser/prefs/pref_registry_syncable.h"
-#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_context.h"