Moved ios popup opening code from Tab to BlockedPopupTabHelper.

ios/web/public/test/web_test_with_web_state.mm

 // 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.
 
 #import "ios/web/public/test/web_test_with_web_state.h"
 
 #include "base/run_loop.h"
 #include "base/strings/sys_string_conversions.h"
 #import "base/test/ios/wait_util.h"
 #include "ios/web/public/web_state/url_verification_constants.h"
@@ skipping 21 matching lines @@
   std::unique_ptr<WebStateImpl> web_state(new WebStateImpl(GetBrowserState()));
   web_state->GetNavigationManagerImpl().InitializeSession(NO);
   web_state->SetWebUsageEnabled(true);
   web_state_.reset(web_state.release());
 
   // Force generation of child views; necessary for some tests.
   [GetWebController(web_state_.get()) triggerPendingLoad];
 }
 
 void WebTestWithWebState::TearDown() {
-  web_state_.reset();
+  DestroyWebState();
   WebTest::TearDown();
 }
 
 void WebTestWithWebState::LoadHtml(NSString* html, const GURL& url) {
   // Sets MIME type to "text/html" once navigation is committed.
   class MimeTypeUpdater : public WebStateObserver {
    public:
     explicit MimeTypeUpdater(WebState* web_state)
         : WebStateObserver(web_state) {}
     // WebStateObserver overrides:
@@ skipping 72 matching lines @@
       completionHandler:^(id result, NSError* error) {
         executionResult.reset([result copy]);
         executionCompleted = true;
       }];
   base::test::ios::WaitUntilCondition(^{
     return executionCompleted;
   });
   return [[executionResult retain] autorelease];
 }
 
+void WebTestWithWebState::DestroyWebState() {
+  web_state_.reset();
+}
+
 std::string WebTestWithWebState::BaseUrl() const {
   web::URLVerificationTrustLevel unused_level;
   return web_state()->GetCurrentURL(&unused_level).spec();
 }
 
 web::WebState* WebTestWithWebState::web_state() {
   return web_state_.get();
 }
 
 const web::WebState* WebTestWithWebState::web_state() const {
   return web_state_.get();
 }
 
 void WebTestWithWebState::WillProcessTask(const base::PendingTask&) {
   // Nothing to do.
 }
 
 void WebTestWithWebState::DidProcessTask(const base::PendingTask&) {
   processed_a_task_ = true;
 }
 
 }  // namespace web