Format all Python scripts

Some Python scripts weren't formatted - particularly scripts with just
the shebang and not the .py suffix. Run:

git ls-tree --full-tree --name-only -r HEAD | xargs grep -l '#!.*python' | xargs yapf -i chromium

to format them.

Change-Id: I68eae3e10496de558b184e9e16aaa1ba12b240e2

tools/package-prebuilts-for-github-release

diff --git a/tools/package-prebuilts-for-github-release b/tools/package-prebuilts-for-github-release
index d7a9414..4c638f5 100755
--- a/tools/package-prebuilts-for-github-release
+++ b/tools/package-prebuilts-for-github-release
@@ -12,7 +12,6 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
 """Pulls LUCI-generated binaries and generates .zip files for GitHub releases.
 
 Usage: ./tools/package_prebuilts_for_github_release v20.0
@@ -51,5 +50,6 @@
   print('')
   print('%d zip files saved in %s (%s)' % (len(zips), tmpdir, ','.join(zips)))
 
+
 if __name__ == '__main__':
   sys.exit(main())