Moved ios popup opening code from Tab to BlockedPopupTabHelper.

ios/web/public/test/fakes/test_web_state_delegate.mm

Index: ios/web/public/test/fakes/test_web_state_delegate.mm
diff --git a/ios/web/public/test/fakes/test_web_state_delegate.mm b/ios/web/public/test/fakes/test_web_state_delegate.mm
index a39139c7a3502835b990fb9bc0b72204b9da234e..6019215f717b04425aa2ae8581d245ca1ab639d0 100644
--- a/ios/web/public/test/fakes/test_web_state_delegate.mm
+++ b/ios/web/public/test/fakes/test_web_state_delegate.mm
@@ -8,6 +8,17 @@
 
 namespace web {
 
+TestOpenURLRequest::TestOpenURLRequest()
+    : params(GURL(),
+             Referrer(),
+             WindowOpenDisposition::UNKNOWN,
+             ui::PAGE_TRANSITION_LINK,
+             false) {}
+
+TestOpenURLRequest::~TestOpenURLRequest() = default;
+
+TestOpenURLRequest::TestOpenURLRequest(const TestOpenURLRequest&) = default;
+
 TestRepostFormRequest::TestRepostFormRequest() {}
 
 TestRepostFormRequest::~TestRepostFormRequest() = default;
@@ -26,6 +37,15 @@ TestWebStateDelegate::TestWebStateDelegate() {}
 
 TestWebStateDelegate::~TestWebStateDelegate() = default;
 
+WebState* TestWebStateDelegate::OpenURLFromWebState(
+    WebState* web_state,
+    const WebState::OpenURLParams& params) {
+  last_open_url_request_ = base::MakeUnique<TestOpenURLRequest>();
+  last_open_url_request_->web_state = web_state;
+  last_open_url_request_->params = params;
+  return nullptr;
+}
+
 JavaScriptDialogPresenter* TestWebStateDelegate::GetJavaScriptDialogPresenter(
     WebState*) {
   get_java_script_dialog_presenter_called_ = true;