[ios] Convert BlockedPopupHandler into a tab helper class.

ios/chrome/browser/web/blocked_popup_handler.mm

Index: ios/chrome/browser/web/blocked_popup_handler.mm
diff --git a/ios/chrome/browser/web/blocked_popup_handler.mm b/ios/chrome/browser/web/blocked_popup_handler.mm
index 40c6b71212cced9327d62f0164fdc50de0c0997d..f4eab97dbed20725f340eb056d39df501c567b54 100644
--- a/ios/chrome/browser/web/blocked_popup_handler.mm
+++ b/ios/chrome/browser/web/blocked_popup_handler.mm
@@ -17,12 +17,15 @@
 #include "components/infobars/core/infobar.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/content_settings/host_content_settings_map_factory.h"
+#include "ios/chrome/browser/infobars/infobar_manager_impl.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/web/public/referrer.h"
 #include "net/base/mac/url_conversions.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/image/image.h"
 
+DEFINE_WEB_STATE_USER_DATA_KEY(BlockedPopupHandler);
+
 namespace {
 // The infobar to display when a popup is blocked.
 class BlockPopupInfoBarDelegate : public ConfirmInfoBarDelegate {
@@ -85,27 +88,28 @@ class BlockPopupInfoBarDelegate : public ConfirmInfoBarDelegate {
 };
 }  // namespace
 
-BlockedPopupHandler::BlockedPopupHandler(ios::ChromeBrowserState* browser_state)
-    : browser_state_(browser_state),
-      delegate_(nullptr),
-      infobar_(nullptr),
-      scoped_observer_(this) {}
+// static
+void BlockedPopupHandler::CreateForWebState(web::WebState* web_state) {
+  DCHECK(web_state);
+  if (!FromWebState(web_state)) {
+    web_state->SetUserData(UserDataKey(), new BlockedPopupHandler(web_state));
+  }
+}
+
+BlockedPopupHandler::BlockedPopupHandler(web::WebState* web_state)
+    : web_state_(web_state), infobar_(nullptr), scoped_observer_(this) {}
 
 BlockedPopupHandler::~BlockedPopupHandler() {}
 
-void BlockedPopupHandler::SetDelegate(
-    id<BlockedPopupHandlerDelegate> delegate) {
-  scoped_observer_.RemoveAll();
-  delegate_ = delegate;
-  if (delegate_)
-    scoped_observer_.Add([delegate_ infoBarManager]);
+void BlockedPopupHandler::Initialize() {
+  infobars::InfoBarManager* manager =
+      InfoBarManagerImpl::FromWebState(web_state_);
+  DCHECK(manager);
+  scoped_observer_.Add(manager);
 }
 
 void BlockedPopupHandler::HandlePopup(
     const web::BlockedPopupInfo& blocked_popup_info) {
-  if (!delegate_)
-    return;
-
   popups_.push_back(blocked_popup_info);
   ShowInfoBar();
 }
@@ -124,13 +128,17 @@ void BlockedPopupHandler::OnManagerShuttingDown(
 }
 
 void BlockedPopupHandler::ShowInfoBar() {
-  if (!popups_.size() || !delegate_)
+  infobars::InfoBarManager* infobar_manager =
+      InfoBarManagerImpl::FromWebState(web_state_);
+  if (!popups_.size() || !infobar_manager)
     return;
-  infobars::InfoBarManager* infobar_manager = [delegate_ infoBarManager];
+
+  ios::ChromeBrowserState* browser_state =
+      ios::ChromeBrowserState::FromBrowserState(web_state_->GetBrowserState());
   std::unique_ptr<infobars::InfoBar> infobar =
       infobar_manager->CreateConfirmInfoBar(
           std::unique_ptr<ConfirmInfoBarDelegate>(
-              new BlockPopupInfoBarDelegate(browser_state_, popups_)));
+              new BlockPopupInfoBarDelegate(browser_state, popups_)));
   if (infobar_) {
     infobar_ = infobar_manager->ReplaceInfoBar(infobar_, std::move(infobar));
   } else {