Update AppLauncherTabHelper to treat blob URLs as non-app URLs.

From https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL:
The URL.createObjectURL() static method creates a DOMString containing a
URL representing the object given in the parameter. The URL lifetime is
tied to the document in the window on which it was created. The new
object URL represents the specified File object or Blob object.

These URLs have blob: scheme.

Bug: None
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I6da3069663e735ce89977b15cfee7933a3c20ea1
Reviewed-on: https://chromium-review.googlesource.com/1250163Reviewed-by: Mohammad Refaat <mrefaat@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595147}

ios/chrome/browser/app_launcher/app_launcher_tab_helper.mm

@@ -100,7 +100,8 @@ AppLauncherTabHelper::~AppLauncherTabHelper() = default;
 bool AppLauncherTabHelper::IsAppUrl(const GURL& url) {
   return !(web::UrlHasWebScheme(url) ||
            web::GetWebClient()->IsAppSpecificURL(url) ||
-           url.SchemeIs(url::kFileScheme) || url.SchemeIs(url::kAboutScheme));
+           url.SchemeIs(url::kFileScheme) || url.SchemeIs(url::kAboutScheme) ||
+           url.SchemeIs(url::kBlobScheme));
 }
 
 bool AppLauncherTabHelper::RequestToLaunchApp(const GURL& url,

ios/chrome/browser/app_launcher/app_launcher_tab_helper_unittest.mm

@@ -277,6 +277,9 @@ TEST_F(AppLauncherTabHelperTest, ShouldAllowRequestWithNonAppUrl) {
   EXPECT_TRUE(TestShouldAllowRequest(@"data://test",
                                      /*target_frame_is_main=*/false,
                                      /*has_user_gesture=*/true));
+  EXPECT_TRUE(TestShouldAllowRequest(@"blob://test",
+                                     /*target_frame_is_main=*/false,
+                                     /*has_user_gesture=*/true));
   EXPECT_EQ(0U, delegate_.countOfAppsLaunched);
 }