Update usage of Proguard in clank after moving Proguard to third_party.

build/java_prebuilt.gypi

 # 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.
 
 # This file is meant to be included into a target to provide a rule
 # to package prebuilt Java JARs in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my-package_java',
@@ skipping 45 matching lines @@
       ],
     },
   },
   'conditions' : [
     ['proguard_preprocess == 1', {
       'actions': [
         {
           'action_name': 'proguard_<(_target_name)',
           'message': 'Proguard preprocessing <(_target_name) jar',
           'inputs': [
-            '<(android_sdk_root)/tools/proguard/lib/proguard.jar',
+            '<(DEPTH)/third_party/proguard/lib/proguard.jar',
             '<(DEPTH)/build/android/gyp/util/build_utils.py',
             '<(DEPTH)/build/android/gyp/proguard.py',
             '<(jar_path)',
             '<(proguard_config)',
           ],
           'outputs': [
             '<(dex_input_jar_path)',
           ],
           'action': [
             'python', '<(DEPTH)/build/android/gyp/proguard.py',
-            '--proguard-path=<(android_sdk_root)/tools/proguard/lib/proguard.jar',
+            '--proguard-path=<(DEPTH)/third_party/proguard/lib/proguard.jar',
             '--input-path=<(jar_path)',
             '--output-path=<(dex_input_jar_path)',
             '--proguard-config=<(proguard_config)',
             '--classpath=>(input_jars_paths)',
           ]
         },
       ],
     }],
     ['neverlink == 0', {
       'actions': [
         {
           'action_name': 'dex_<(_target_name)',
           'message': 'Dexing <(_target_name) jar',
           'variables': {
             'dex_input_paths': [
               '<(dex_input_jar_path)',
             ],
             'output_path': '<(dex_path)',
           },
           'includes': [ 'android/dex_action.gypi' ],
         },
       ],
     }],
   ],
 }