[ObjC ARC] Converts ios/chrome/browser/passwords:unit_tests to ARC.

ios/web/public/test/test_web_state.h

 // 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.
 
 #ifndef IOS_WEB_PUBLIC_TEST_TEST_WEB_STATE_H_
 #define IOS_WEB_PUBLIC_TEST_TEST_WEB_STATE_H_
 
 #include <stdint.h>
 
 #include <string>
 
+#include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "ios/web/public/web_state/url_verification_constants.h"
 #include "ios/web/public/web_state/web_state.h"
 #include "url/gurl.h"
 
 namespace web {
 
 // Minimal implementation of WebState, to be used in tests.
 class TestWebState : public WebState {
  public:
@@ skipping 28 matching lines @@
   const GURL& GetLastCommittedURL() const override;
   GURL GetCurrentURL(URLVerificationTrustLevel* trust_level) const override;
   void ShowTransientContentView(CRWContentView* content_view) override {}
   void AddScriptCommandCallback(const ScriptCommandCallback& callback,
                                 const std::string& command_prefix) override {}
   void RemoveScriptCommandCallback(const std::string& command_prefix) override {
   }
   CRWWebViewProxyType GetWebViewProxy() const override;
   bool IsShowingWebInterstitial() const override;
   WebInterstitial* GetWebInterstitial() const override;
-  void AddObserver(WebStateObserver* observer) override {}
-  void RemoveObserver(WebStateObserver* observer) override {}
+
+  void AddObserver(WebStateObserver* observer) override;
+
+  void RemoveObserver(WebStateObserver* observer) override;
+
   void AddPolicyDecider(WebStatePolicyDecider* decider) override {}
   void RemovePolicyDecider(WebStatePolicyDecider* decider) override {}
   int DownloadImage(const GURL& url,
                     bool is_favicon,
                     uint32_t max_bitmap_size,
                     bool bypass_cache,
                     const ImageDownloadCallback& callback) override;
   service_manager::InterfaceRegistry* GetMojoInterfaceRegistry() override;
   base::WeakPtr<WebState> AsWeakPtr() override;
 
   // Setters for test data.
   void SetContentIsHTML(bool content_is_html);
   void SetLoading(bool is_loading);
   void SetCurrentURL(const GURL& url);
   void SetTrustLevel(URLVerificationTrustLevel trust_level);
 
  private:
   bool web_usage_enabled_;
   bool is_loading_;
   GURL url_;
   base::string16 title_;
   URLVerificationTrustLevel trust_level_;
   bool content_is_html_;
   std::string mime_type_;
   std::string content_language_;
+
+  // A list of observers notified when page state changes. Weak references.
+  base::ObserverList<WebStateObserver, true> observers_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_TEST_TEST_WEB_STATE_H_