[tools] : is a reserved character and shouldn't be used in a query parameter,

tools/bisect-builds.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Snapshot Build Bisect Tool
 
 This script bisects a snapshot archive using binary search. It starts at
 a bad revision (it will try to guess HEAD) and asks for a last known-good
 revision. It will then binary search across this revision range by downloading,
 unzipping, and opening Chromium for you. After testing the specific revision,
 it will ask you whether it is good or bad before continuing the search.
 """
 
 # The root URL for storage.
 BASE_URL = 'http://commondatastorage.googleapis.com/chromium-browser-snapshots'
 
 # URL to the ViewVC commit page.
 BUILD_VIEWVC_URL = 'http://src.chromium.org/viewvc/chrome?view=rev&revision=%d'
 
 # Changelogs URL.
 CHANGELOG_URL = 'http://build.chromium.org/f/chromium/' \
-                'perf/dashboard/ui/changelog.html?url=/trunk/src&range=%d:%d'
+                'perf/dashboard/ui/changelog.html?url=/trunk/src&range=%d%%3A%d'
 
 # DEPS file URL.
 DEPS_FILE= 'http://src.chromium.org/viewvc/chrome/trunk/src/DEPS?revision=%d'
 
 # WebKit Changelogs URL.
 WEBKIT_CHANGELOG_URL = 'http://trac.webkit.org/log/' \
                        'trunk/?rev=%d&stop_rev=%d&verbose=on'
 
 ###############################################################################
 
@@ skipping 514 matching lines @@
     print WEBKIT_CHANGELOG_URL % (first_known_bad_webkit_rev,
                                   last_known_good_webkit_rev)
   print 'CHANGELOG URL:'
   print CHANGELOG_URL % (last_known_good_rev, first_known_bad_rev)
   print 'Built at revision:'
   print BUILD_VIEWVC_URL % first_known_bad_rev
 
 
 if __name__ == '__main__':
   sys.exit(main())