Explicitly ShutdownOnUIThread the HostContentSettingsMap when destroying the Profile.

chrome/browser/content_settings/content_settings_mock_provider.h

Index: chrome/browser/content_settings/content_settings_mock_provider.h
diff --git a/chrome/browser/content_settings/content_settings_mock_provider.h b/chrome/browser/content_settings/content_settings_mock_provider.h
index dbf006ce409b8726372eb2d0303cda833b7c2a2b..3962dea237bd3fee83e883d977c5fc08ed5ee859 100644
--- a/chrome/browser/content_settings/content_settings_mock_provider.h
+++ b/chrome/browser/content_settings/content_settings_mock_provider.h
@@ -29,6 +29,7 @@ class MockDefaultProvider : public DefaultProviderInterface {
   virtual void UpdateDefaultSetting(ContentSettingsType content_type,
                                     ContentSetting setting);
   virtual bool DefaultSettingIsManaged(ContentSettingsType content_type) const;
+  virtual void ShutdownOnUIThread();
 
  private:
   ContentSettingsType content_type_;
@@ -76,6 +77,8 @@ class MockProvider : public ProviderInterface {
   virtual void ClearAllContentSettingsRules(
       ContentSettingsType content_type) {}
 
+  virtual void ShutdownOnUIThread() {}
+
   // Accessors
   void set_requesting_url_pattern(ContentSettingsPattern pattern) {
     requesting_url_pattern_ = pattern;