Remove all traces of pref hash stores after last store reset.

chrome/browser/prefs/tracked/pref_service_hash_store_contents_unittest.cc

 // Copyright 2014 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 "chrome/browser/prefs/tracked/pref_service_hash_store_contents.h"
 
 #include <string>
 
 #include "base/prefs/pref_service.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/values.h"
+#include "chrome/common/pref_names.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class PrefServiceHashStoreContentsTest : public testing::Test {
  public:
   virtual void SetUp() OVERRIDE {
     PrefServiceHashStoreContents::RegisterPrefs(local_state_.registry());
   }
 
  protected:
   TestingPrefServiceSimple local_state_;
@@ skipping 14 matching lines @@
   {
     PrefServiceHashStoreContents contents("store_id", &local_state_);
     ASSERT_TRUE(contents.IsInitialized());
     PrefServiceHashStoreContents other_contents("other_store_id",
                                                 &local_state_);
     ASSERT_FALSE(other_contents.IsInitialized());
   }
 }
 
 TEST_F(PrefServiceHashStoreContentsTest, Reset) {
+  ASSERT_FALSE(local_state_.GetUserPrefValue(prefs::kProfilePreferenceHashes));
+
   {
     PrefServiceHashStoreContents contents("store_id", &local_state_);
     ASSERT_FALSE(contents.IsInitialized());
     (*contents.GetMutableContents())->Set("foo", new base::StringValue("bar"));
     ASSERT_TRUE(contents.IsInitialized());
     PrefServiceHashStoreContents other_contents("other_store_id",
                                                 &local_state_);
     (*other_contents.GetMutableContents())
         ->Set("foo", new base::StringValue("bar"));
   }
+
+  ASSERT_TRUE(local_state_.GetUserPrefValue(prefs::kProfilePreferenceHashes));
+
   {
     PrefServiceHashStoreContents contents("store_id", &local_state_);
     ASSERT_TRUE(contents.IsInitialized());
     contents.Reset();
     ASSERT_FALSE(contents.IsInitialized());
   }
+
+  ASSERT_TRUE(local_state_.GetUserPrefValue(prefs::kProfilePreferenceHashes));
+
   {
     PrefServiceHashStoreContents contents("store_id", &local_state_);
     ASSERT_FALSE(contents.IsInitialized());
     PrefServiceHashStoreContents other_contents("other_store_id",
                                                 &local_state_);
     ASSERT_TRUE(other_contents.IsInitialized());
   }
+
+  {
+    PrefServiceHashStoreContents other_contents("other_store_id",
+                                                &local_state_);
+    other_contents.Reset();
+  }
+
+  ASSERT_FALSE(local_state_.GetUserPrefValue(prefs::kProfilePreferenceHashes));
 }
 
 TEST_F(PrefServiceHashStoreContentsTest, GetAndSetContents) {
   {
     PrefServiceHashStoreContents contents("store_id", &local_state_);
     ASSERT_EQ(NULL, contents.GetContents());
     (*contents.GetMutableContents())->Set("foo", new base::StringValue("bar"));
     ASSERT_FALSE(contents.GetContents() == NULL);
     std::string actual_value;
     ASSERT_TRUE(contents.GetContents()->GetString("foo", &actual_value));
@@ skipping 44 matching lines @@
 
   PrefServiceHashStoreContents::ResetAllPrefHashStores(&local_state_);
 
   {
     PrefServiceHashStoreContents contents_1("store_id_1", &local_state_);
     PrefServiceHashStoreContents contents_2("store_id_2", &local_state_);
     ASSERT_FALSE(contents_1.IsInitialized());
     ASSERT_FALSE(contents_2.IsInitialized());
   }
 }