[cr149][Android] Fix for media notification icon

Chromium changes:
https://chromium.googlesource.com/chromium/src/+/9ab824fa9271d9281b735132c9a8b32e1cc75db8

commit 9ab824fa9271d9281b735132c9a8b32e1cc75db8
Author: Tommy Steimel <steimel@chromium.org>
Date:   Wed Apr 22 16:27:14 2026 -0700

    [Android Media Notification] Use Chrome icon instead of sound icon

    The Android media notification icon we use is a sound icon, which looks
    like it's an interactive button that can mute the playback. This CL
    changes the icon to be a Chrome icon instead.

    Bug: 505004595
    Change-Id: I55a48173466bde0004f43d47ba1662e11c711b1a
    Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7786539
    Commit-Queue: Tommy Steimel <steimel@chromium.org>
    Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#1619176}

android/nala/icons.gni

@@ -26,6 +26,11 @@ nala_icon_overrides = [
     source = "ic_minus.xml"
     dest = "ic_remove.xml"
   },
+  {
+    # Override Chromium's product icon in media notifications with the Brave shield.
+    source = "ic_brave_icon_monochrome.xml"
+    dest = "chrome_product_vd_24.xml"
+  },
 ]
 
 # Please keep this list sorted alphabetically.