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 3a6f7e3eacd29cc6a9ac0fd2b3aec10690069e2a..1ca1b09cf2abeb8ea44e067e54ce78421345a163 100644
--- a/chrome/browser/content_settings/content_settings_mock_provider.h
+++ b/chrome/browser/content_settings/content_settings_mock_provider.h
@@ -30,6 +30,7 @@ class MockDefaultProvider : public DefaultProviderInterface {
                                     ContentSetting setting);
   virtual void ResetToDefaults();
   virtual bool DefaultSettingIsManaged(ContentSettingsType content_type) const;
+  virtual void ShutdownOnUIThread();
 
  private:
   ContentSettingsType content_type_;
@@ -79,6 +80,8 @@ class MockProvider : public ProviderInterface {
 
   virtual void ResetToDefaults() {}
 
+  virtual void ShutdownOnUIThread() {}
+
   // Accessors
   void set_requesting_url_pattern(ContentSettingsPattern pattern) {
     requesting_url_pattern_ = pattern;