start requesting updates to shell apk v109

For browser installed WebAPKs, v109 has adaptive icon support

Bug: 977173
Change-Id: Ic3b5e1b118dbe5ddb05fdaa662ae1ed9e81c6340
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879547Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Commit-Queue: Henry Jian <hzjian@google.com>
Cr-Commit-Position: refs/heads/master@{#709119}

chrome/android/webapk/shell_apk/request_update_for_version.gni

@@ -6,4 +6,4 @@
 # if the WebAPK's ShellAPK version is less than
 # |request_update_for_shell_apk_version|. The version should be incremented
 # after a new ShellAPK has been uploaded to the WebAPK Minting Server.
-request_update_for_shell_apk_version = 89
+request_update_for_shell_apk_version = 109