Update from https://crrev.com/314320

TBR=jamesr@chromium.org

Review URL: https://codereview.chromium.org/895853003
diff --git a/build/get_sdk_extras_packages.py b/build/get_sdk_extras_packages.py
index 32e5564..6d870cc 100755
--- a/build/get_sdk_extras_packages.py
+++ b/build/get_sdk_extras_packages.py
@@ -7,7 +7,7 @@
 import os
 import sys
 
-SDK_EXTRAS_JSON_FILE = os.path.join(os.path.dirname(sys.argv[0]),
+SDK_EXTRAS_JSON_FILE = os.path.join(os.path.dirname(__file__),
                                     'android_sdk_extras.json')
 
 def main():