Moved ios popup opening code from Tab to BlockedPopupTabHelper.

ios/web/public/test/web_test_with_web_state.h

 // Copyright 2016 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_WEB_TEST_WITH_WEB_STATE_H_
 #define IOS_WEB_PUBLIC_TEST_WEB_TEST_WITH_WEB_STATE_H_
 
 #import "base/ios/block_types.h"
 #include "base/message_loop/message_loop.h"
 #include "ios/web/public/test/web_test.h"
@@ skipping 21 matching lines @@
   // Loads the specified HTML content into the WebState, using test url name.
   void LoadHtml(const std::string& html);
   // Blocks until both known NSRunLoop-based and known message-loop-based
   // background tasks have completed
   void WaitForBackgroundTasks();
   // Blocks until known NSRunLoop-based have completed, known message-loop-based
   // background tasks have completed and |condition| evaluates to true.
   void WaitForCondition(ConditionBlock condition);
   // Synchronously executes JavaScript and returns result as id.
   id ExecuteJavaScript(NSString* script);
+  // Destroys underlying WebState. web_state() will return null after this call.
+  void DestroyWebState();
 
   // Returns the base URL of the loaded page.
   std::string BaseUrl() const;
 
   // Returns web state for this web controller.
   web::WebState* web_state();
   const web::WebState* web_state() const;
 
  private:
   // base::MessageLoop::TaskObserver overrides.
   void WillProcessTask(const base::PendingTask& pending_task) override;
   void DidProcessTask(const base::PendingTask& pending_task) override;
 
   // The web state for testing.
   std::unique_ptr<WebState> web_state_;
   // true if a task has been processed.
   bool processed_a_task_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_TEST_WEB_TEST_WITH_WEB_STATE_H_