[ios] Fixes BOOL/bool mismatches in AppLauncher and QrCode.

BOOL and bool are equivalent on arm64, but they map to different underlying
types on other platforms, such as Mac Catalyst.

BUG=1142431

Change-Id: I871e83e958ddc4619da634a972036599fc6d02db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498801Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820742}

ios/chrome/browser/app_launcher/app_launcher_tab_helper.mm

@@ -144,7 +144,7 @@ void AppLauncherTabHelper::RequestToLaunchApp(const GURL& url,
       if (!delegate_)
         return;
       delegate_->ShowRepeatedAppLaunchAlert(
-          this, base::BindOnce(^(BOOL user_allowed) {
+          this, base::BindOnce(^(bool user_allowed) {
             if (!weak_this.get())
               return;
             if (user_allowed && weak_this->delegate()) {

ios/chrome/browser/ui/activity_services/activities/generate_qr_code_activity.mm

@@ -55,7 +55,7 @@ NSString* const kGenerateQrCodeActivityType =
 }
 
 - (BOOL)canPerformWithActivityItems:(NSArray*)activityItems {
-  return self.handler;
+  return self.handler != nil;
 }
 
 + (UIActivityCategory)activityCategory {