Fix JS interface for synthetic smooth scroll.

We recently renamed the starting coordinates of a synthetic smooth scroll from
mouse_event_{x,y} to start_{x,y}. However, some uses of these variables have not
been renamed accordingly. This patch fixes that.

BUG=297980

Review URL: https://codereview.chromium.org/96743003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238076 0039d316-1c4b-4281-b951-d872f2087c98
file_manager: Allow renaming of Drive files even when offline

BUG=260538
TEST=Disconnect the device from networks. Open Files.app and move to Google Drive. Try to rename a file.

Review URL: https://codereview.chromium.org/98543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238077 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238077