GitLab

Event names and dictionary values in the event router of Files.app can be
replaced with constants and types generated by the IDL compiler.

BUG=330638
TEST=none

Review URL: https://codereview.chromium.org/107813005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243525 0039d316-1c4b-4281-b951-d872f2087c98