[SyncFS] Clean up for change list handling

BUG=240165
R=kinuko

Review URL: https://codereview.chromium.org/31903004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230087 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230087
Blink roll 160126:160139

http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=160127:160139&mode=html
TBR=
BUG=

Review URL: https://codereview.chromium.org/33813005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230088 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230089 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230088
SVN changes up to revision 230089