[Tools] Unbreak fetch_deps.py after Chromium r249077.

depot_tools commit 249077 broke our fetch_deps.py because gclient does not
accept absolute paths in --gclient-file anymore.

Since we already set cwd when calling
gclient_utils.CheckCallAndFilterAndHeader(), we can just strip the rest of
the path in self._new_gclient_file to fix things.

BUG=https://crosswalk-project.org/jira/browse/XWALK-930

(cherry picked from commit db574173408c8dd4dddd9102400a0decb80ebd96)
Merge pull request #1561 from rakuco/backport-db5741

BACKPORT: [Tools] Unbreak fetch_deps.py after Chromium r249077.
Bump version to 4.32.76.2
[Android] Fix packaging tool fails to build application when
manifest.json doesn't include "icons" object.

In the manifest_json_parser.py, "icons" object with multiple entries in manifest.json
is represented as a dictionary, so it should not be a string even if it's empty.

Packaging tool would fail when iterating the dictionary if "icons" object was unset
in manifest.json.

BUG=https://crosswalk-project.org/jira/browse/XWALK-909