Patch contributed by Leung Wing Chung <lwchkg@gmail.com>.
Committed on his behalf due to Commit Queue's mishandling of
CRLF files.

Here is my procedure for testing for a new install

1. Download and unzip
   https://src.chromium.org/svn/trunk/tools/depot_tools.zip
   Note that the path should include a space character,
   e.g. "with a space"

2. Copy the three modified files to the unzipped folder

3. Convert the unzipped files into Windows CRLF.

4. REMOVE the following lines from update_depot_tools.bat
   (Should I file a separate bug for this?)

:: Initialize/update virtualenv.
cd /d "%DEPOT_TOOLS_DIR%."
python -u bootstrap\bootstrap.py --deps_file bootstrap\deps.pyl --quiet ENV
if errorlevel 1 goto :EOF

5. Run gclient. Installation should be okay until
   "git rebase" is run.

R=maruel@chromium.org
BUG=507301

Review URL: https://codereview.chromium.org/1232023004 .

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@296275 0039d316-1c4b-4281-b951-d872f2087c98