adb_profile_chrome: Fix html output mode

Fix the mode for writing out traces in HTML format. There is a new
third_party/trace-viewer/build/trace2html.py tool that we should use for
this purpose.

NOTRY=true

Review URL: https://codereview.chromium.org/177943003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252921 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252921