[Android] Update Android WebView license checking tool.

build/android/buildbot_functions.sh

 #!/bin/bash
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # Bash functions used by buildbot annotator scripts for the android
 # build of chromium.  Executing this script should not perform actions
 # other than setting variables and defining of functions.
 
 # Number of jobs on the compile line; e.g.  make -j"${JOBS}"
@@ skipping 294 matching lines @@
   )
 }
 
 # Runs the license checker for the WebView build.
 function bb_check_webview_licenses {
   echo "@@@BUILD_STEP Check licenses for WebView@@@"
   (
   set +e
   cd "${SRC_ROOT}"
   python android_webview/tools/webview_licenses.py scan
-  local license_exit_code = $?
+  local license_exit_code=$?
   if [[ license_exit_code -ne 0 ]]; then
     echo "@@@STEP_FAILURE@@@"
   fi
   return $license_exit_code
   )
 }