Revert of Move base/prefs to components/prefs

components/prefs/default_pref_store_unittest.cc

Index: components/prefs/default_pref_store_unittest.cc
diff --git a/components/prefs/default_pref_store_unittest.cc b/components/prefs/default_pref_store_unittest.cc
deleted file mode 100644
index 597ca558a4f7ac6f1b5bc8b3a2b4a46f4785133b..0000000000000000000000000000000000000000
--- a/components/prefs/default_pref_store_unittest.cc
+++ /dev/null
@@ -1,70 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/macros.h"
-#include "base/prefs/default_pref_store.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-using base::StringValue;
-using base::Value;
-
-namespace {
-
-class MockPrefStoreObserver : public PrefStore::Observer {
- public:
-  explicit MockPrefStoreObserver(DefaultPrefStore* pref_store);
-  ~MockPrefStoreObserver() override;
-
-  int change_count() {
-    return change_count_;
-  }
-
-  // PrefStore::Observer implementation:
-  void OnPrefValueChanged(const std::string& key) override;
-  void OnInitializationCompleted(bool succeeded) override {}
-
- private:
-  DefaultPrefStore* pref_store_;
-
-  int change_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(MockPrefStoreObserver);
-};
-
-MockPrefStoreObserver::MockPrefStoreObserver(DefaultPrefStore* pref_store)
-    : pref_store_(pref_store), change_count_(0) {
-  pref_store_->AddObserver(this);
-}
-
-MockPrefStoreObserver::~MockPrefStoreObserver() {
-  pref_store_->RemoveObserver(this);
-}
-
-void MockPrefStoreObserver::OnPrefValueChanged(const std::string& key) {
-  change_count_++;
-}
-
-}  // namespace
-
-TEST(DefaultPrefStoreTest, NotifyPrefValueChanged) {
-  scoped_refptr<DefaultPrefStore> pref_store(new DefaultPrefStore);
-  MockPrefStoreObserver observer(pref_store.get());
-  std::string kPrefKey("pref_key");
-
-  // Setting a default value shouldn't send a change notification.
-  pref_store->SetDefaultValue(kPrefKey,
-                              scoped_ptr<Value>(new StringValue("foo")));
-  EXPECT_EQ(0, observer.change_count());
-
-  // Replacing the default value should send a change notification...
-  pref_store->ReplaceDefaultValue(kPrefKey,
-                                  scoped_ptr<Value>(new StringValue("bar")));
-  EXPECT_EQ(1, observer.change_count());
-
-  // But only if the value actually changed.
-  pref_store->ReplaceDefaultValue(kPrefKey,
-                                  scoped_ptr<Value>(new StringValue("bar")));
-  EXPECT_EQ(1, observer.change_count());
-}
-