webauthn: fix caBLE Activity title.

Although this APP_NAME pattern is used elsewhere, it doesn't work in
this context because the string ends up getting processed by the Android
system and thus there's no possibility to insert the substring. Lots of
other strings in this file mention Chrome directly, so do that.

(Skipping screenshot requirement because the screenshot already exists
and the context isn't changed.)

BUG=1002262

Change-Id: Ic393a88f2b546aa72438d0da6a71aad666f5a256
Skip-Translation-Screenshots-Check: True
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2477517Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Auto-Submit: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817941}

chrome/browser/ui/android/strings/android_chrome_strings.grd

@@ -3999,7 +3999,7 @@ Data from your Incognito session will only be cleared from Chrome when you <ph n
 
       <message name="IDS_CABLEV2_ACTIVITY_TITLE"
         desc="The label of the Activity for using your phone as a security key. A 'security key' in this context is generally a small USB device that is used for logging into websites. This feature allows Chrome on an Android phone to act as a security key. A user may see it in Android permissions prompts (see screenshot).">
-         Google <ph name="APP_NAME">%1$s<ex>Chrome</ex></ph> as a Security Key
+         Google Chrome as a Security Key
       </message>
 
       <!-- QR Code -->