Introduce per-tab preferences service.

chrome/browser/prefs/pref_notifier_impl_unittest.cc

Index: chrome/browser/prefs/pref_notifier_impl_unittest.cc
diff --git a/chrome/browser/prefs/pref_notifier_impl_unittest.cc b/chrome/browser/prefs/pref_notifier_impl_unittest.cc
index bf991e2a71b3879951be23a2af7ba505a99b6e67..7397afdb64e60aa012e13b0630c23e28ef472e5f 100644
--- a/chrome/browser/prefs/pref_notifier_impl_unittest.cc
+++ b/chrome/browser/prefs/pref_notifier_impl_unittest.cc
@@ -29,8 +29,6 @@ const char kUnchangedPref[] = "unchanged_pref";
 // Test PrefNotifier that allows tracking of observers and notifications.
 class MockPrefNotifier : public PrefNotifierImpl {
  public:
-  explicit MockPrefNotifier(PrefService* pref_service)
-      : PrefNotifierImpl(pref_service) {}
   virtual ~MockPrefNotifier() {}
 
   MOCK_METHOD1(FireObservers, void(const std::string& path));
@@ -73,13 +71,15 @@ class PrefNotifierTest : public testing::Test {
 };
 
 TEST_F(PrefNotifierTest, OnPreferenceChanged) {
-  MockPrefNotifier notifier(&pref_service_);
+  MockPrefNotifier notifier;
+  notifier.SetPrefService(&pref_service_);
   EXPECT_CALL(notifier, FireObservers(kChangedPref)).Times(1);
   notifier.OnPreferenceChanged(kChangedPref);
 }
 
 TEST_F(PrefNotifierTest, OnInitializationCompleted) {
-  MockPrefNotifier notifier(&pref_service_);
+  MockPrefNotifier notifier;
+  notifier.SetPrefService(&pref_service_);
   content::NotificationObserverMock observer;
   content::NotificationRegistrar registrar;
   registrar.Add(&observer, chrome::NOTIFICATION_PREF_INITIALIZATION_COMPLETED,
@@ -95,7 +95,8 @@ TEST_F(PrefNotifierTest, AddAndRemovePrefObservers) {
   const char pref_name[] = "homepage";
   const char pref_name2[] = "proxy";
 
-  MockPrefNotifier notifier(&pref_service_);
+  MockPrefNotifier notifier;
+  notifier.SetPrefService(&pref_service_);
   notifier.AddPrefObserver(pref_name, &obs1_);
   ASSERT_EQ(1u, notifier.CountObserver(pref_name, &obs1_));
   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs1_));
@@ -156,7 +157,8 @@ TEST_F(PrefNotifierTest, AddAndRemovePrefObservers) {
 
 TEST_F(PrefNotifierTest, FireObservers) {
   base::FundamentalValue value_true(true);
-  PrefNotifierImpl notifier(&pref_service_);
+  PrefNotifierImpl notifier;
+  notifier.SetPrefService(&pref_service_);
   notifier.AddPrefObserver(kChangedPref, &obs1_);
   notifier.AddPrefObserver(kUnchangedPref, &obs1_);