apps: convert log processor from app to extension

Switch log processor from chrome app to chrome extension.  This allows
the user to access navigation buttons (back and forward) along with
the ability to search (through the browser UI).  Added an icon to
further prep the log processor for publishing in the chrome web store.

BUG=chromium:526193
TEST=manually tested and ran grunt test

Change-Id: I03306d2b39b28cd5a728ae7cef150f7918089ff2
3 files changed