Removed audiovideo_VL42 from power_LoadTest.
The audiovideo_VL42 test did not have a material impact on the power
draw, but was preventing power_LoadTest from completing gracefully
before battery ran out.

Also made a minor change to youtube URL to make it (again) start autoplaying.

BUG=partner bug 258
TEST=ran the test

Change-Id: I09360765d4ab683e5cfe0946e54b7c05f56bf892

Review URL: http://codereview.chromium.org/3448012
3 files changed