[ios] Convert BlockedPopupHandler into a tab helper class.

ios/chrome/browser/web/BUILD.gn

Index: ios/chrome/browser/web/BUILD.gn
diff --git a/ios/chrome/browser/web/BUILD.gn b/ios/chrome/browser/web/BUILD.gn
index 56c5d25b1b6e1d1c582f68f3151b3503c7effb9d..9ec979d6b2c4f4a8351ee868a04ec9258a36a82d 100644
--- a/ios/chrome/browser/web/BUILD.gn
+++ b/ios/chrome/browser/web/BUILD.gn
@@ -151,8 +151,8 @@ source_set("web_internal") {
     "auto_reload_bridge.mm",
     "auto_reload_controller.h",
     "auto_reload_controller.mm",
-    "blocked_popup_handler.h",
-    "blocked_popup_handler.mm",
+    "blocked_popup_tab_helper.h",
+    "blocked_popup_tab_helper.mm",
     "chrome_web_client.h",
     "chrome_web_client.mm",
     "error_page_content.h",
@@ -181,6 +181,7 @@ source_set("web_internal") {
     "//ios/chrome/browser:browser_impl",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/content_settings",
+    "//ios/chrome/browser/infobars",
     "//ios/chrome/browser/ssl",
     "//ios/chrome/browser/ui/commands",
     "//ios/chrome/browser/ui/overscroll_actions",
@@ -218,6 +219,7 @@ source_set("unit_tests_internal") {
   testonly = true
   sources = [
     "auto_reload_controller_unittest.mm",
+    "blocked_popup_tab_helper_unittest.mm",
     "chrome_web_client_unittest.mm",
     "error_page_content_unittest.mm",
     "external_app_launcher_unittest.mm",
@@ -229,7 +231,9 @@ source_set("unit_tests_internal") {
     ":web_internal",
     "//base",
     "//base/test:test_support",
+    "//components/infobars/core",
     "//ios/chrome/browser/find_in_page",
+    "//ios/chrome/browser/infobars",
     "//ios/chrome/browser/ui",
     "//ios/web",
     "//ios/web:test_support",