Added allowed_hosts to DEPS.

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of 'src').
 #
@@ skipping 72 matching lines @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling lss
   # and whatever else without interference from each other.
   'lss_revision': '952107fa7cea0daaabead28c0e92d579bee517eb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling NaCl
   # and whatever else without interference from each other.
   'nacl_revision': 'd4f6ba5e0cd805c6f8085f5f69d06a5e17341d16', # from svn revision r13748
 }
 
+# Only these hosts are allowed for dependencies in this DEPS file.
+# If you need to add a new host, contact chrome infrastracture team.
+allowed_hosts = [
+  'chromium.googlesource.com',
+  'boringssl.googlesource.com',
+  'pdfium.googlesource.com',
+]
+
 deps = {
   'src/breakpad/src':
    Var('chromium_git') + '/external/google-breakpad/src.git' + '@' + '9b7051fd52f7377dc08e88133e3c0d3da5f105c3', # from svn revision 1375
 
   'src/buildtools':
    Var('chromium_git') + '/chromium/buildtools.git' + '@' +  Var('buildtools_revision'),
 
   'src/sdch/open-vcdiff':
    Var('chromium_git') + '/external/open-vcdiff.git' + '@' + '438f2a5be6d809bc21611a94cd37bfc8c28ceb33', # from svn revision 41
 
@@ skipping 689 matching lines @@
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]