Move the bits of Prefs where production code has only trivially easy

base/prefs/pref_store_observer_mock.h

Index: base/prefs/pref_store_observer_mock.h
diff --git a/chrome/common/pref_store_observer_mock.h b/base/prefs/pref_store_observer_mock.h
similarity index 76%
rename from chrome/common/pref_store_observer_mock.h
rename to base/prefs/pref_store_observer_mock.h
index d3733c83dd340473ed673c5fc2a1ce41c9b8ecce..8252c3b359963e51d0b84012014bab43bf5f3436 100644
--- a/chrome/common/pref_store_observer_mock.h
+++ b/base/prefs/pref_store_observer_mock.h
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_COMMON_PREF_STORE_OBSERVER_MOCK_H_
-#define CHROME_COMMON_PREF_STORE_OBSERVER_MOCK_H_
+#ifndef BASE_PREFS_PREF_STORE_OBSERVER_MOCK_H_
+#define BASE_PREFS_PREF_STORE_OBSERVER_MOCK_H_
 
 #include "base/basictypes.h"
-#include "chrome/common/pref_store.h"
+#include "base/prefs/pref_store.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 // A gmock-ified implementation of PrefStore::Observer.
@@ -22,4 +22,4 @@ class PrefStoreObserverMock : public PrefStore::Observer {
   DISALLOW_COPY_AND_ASSIGN(PrefStoreObserverMock);
 };
 
-#endif  // CHROME_COMMON_PREF_STORE_OBSERVER_MOCK_H_
+#endif  // BASE_PREFS_PREF_STORE_OBSERVER_MOCK_H_