base: Add a couple Pref unit tests to base_unittests target.

chrome/chrome_tests_unit.gypi

Index: chrome/chrome_tests_unit.gypi
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index 056af3c7ab3950f038b6e4ef81aa1ac3d89fceef..a2d62f93733f93b8d06230cb8c58a149bf3909d1 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -19,6 +19,7 @@
         'chrome_resources.gyp:theme_resources',
         'common',
         '../base/base.gyp:test_support_base',
+        '../base/base.gyp:base_prefs_test_support',
         '../content/content.gyp:content_app',
         '../content/content.gyp:test_support_content',
         '../media/media.gyp:media_test_support',
@@ -253,13 +254,6 @@
         'test/ppapi/ppapi_test.cc',
         'test/ppapi/ppapi_test.h',
 
-        # TODO(joi): Move to 'base_prefs' target in base/base.gyp once
-        # Prefs move is complete and dependencies have been broken.
-        '../base/prefs/testing_pref_store.cc',
-        '../base/prefs/testing_pref_store.h',
-        '../base/prefs/pref_store_observer_mock.cc',
-        '../base/prefs/pref_store_observer_mock.h',
-
         '../ui/gfx/image/image_unittest_util.h',
         '../ui/gfx/image/image_unittest_util.cc',
         '../webkit/quota/mock_quota_manager.cc',
@@ -1593,11 +1587,9 @@
 
         # TODO(joi): Move to 'base_prefs' target in base/base.gyp once
         # Prefs move is complete and dependencies have been broken.
+        '../base/prefs/json_pref_store_unittest.cc',

[tfarina, 2013/01/19 20:50:59]

We can move it back to base_unittests and exclude it when OS equal ios.

Would be that fine, Joi?

[Jói, 2013/01/21 10:33:22]

If that passes all bots then I have no issue with it.

         '../base/prefs/public/pref_change_registrar_unittest.cc',
         '../base/prefs/public/pref_member_unittest.cc',
-        '../base/prefs/overlay_user_pref_store_unittest.cc',
-        '../base/prefs/pref_value_map_unittest.cc',
-        '../base/prefs/json_pref_store_unittest.cc',
 
         # TODO(joi): Move the google_apis tests to a separate
         # google_apis_unittests executable.