Get Polymer externs from closure/github (instead of Polymer/bower)

third_party/closure_compiler/compile2.py

 #!/usr/bin/python
 # Copyright 2015 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.
 
 """Runs Closure compiler on JavaScript files to check for errors and produce
 minified output."""
 
 import argparse
 import os
@@ skipping 17 matching lines @@
   _JAR_COMMAND = [
     "java",
     "-jar",
     "-Xms1024m",
     "-client",
     "-XX:+TieredCompilation"
   ]
 
   _MAP_FILE_FORMAT = "%s.map"
 
-  _POLYMER_EXTERNS = os.path.join(_CURRENT_DIR, "..", "polymer",
-                                  "v1_0", "components-chromium",
-                                  "polymer-externs", "polymer.externs.js")
+  _POLYMER_EXTERNS = os.path.join(_CURRENT_DIR, "externs", "polymer-1.0.js")
 
   def __init__(self, verbose=False):
     """
     Args:
       verbose: Whether this class should output diagnostic messages.
       strict: Whether the Closure Compiler should be invoked more strictly.
     """
     self._runner_jar = os.path.join(_CURRENT_DIR, "runner", "runner.jar")
     self._target = None
     self._temp_files = []
@@ skipping 265 matching lines @@
   checker = Checker(verbose=opts.verbose)
 
   found_errors, stderr = checker.check(opts.sources, out_file=opts.out_file,
                                        closure_args=opts.closure_args,
                                        custom_sources=opts.custom_sources)
 
   if found_errors:
     if opts.custom_sources:
       print stderr
     sys.exit(1)