The parameterized template function RunCodecSupportTest is supposed to
invoke tested callback with different combinations of PlatformInfo settings,
but it actually used only initial values of PlatformInfo fields.

Also it seems that H264 is always supported for non-encrypted video, so the
test IsCodecSupportedOnAndroidTest.ClearCodecBehavior should be corrected.
This has been revealed only after fixing parameter variation.

Initial changeset https://codereview.chromium.org/2804883007 was reverted,
I was accessing a vector at index just before checking the index vs
vector size. This time I moved access of the states vector into loop body,
and split RUN_TEST_VECTOR into two macros: RUN_TEST_VECTOR_BEGIN and
RUN_TEST_VECTOR_END.

R=chcunningham, dalecurtis
BUG=709428

Review-Url: https://codereview.chromium.org/2808373002
Cr-Commit-Position: refs/heads/master@{#463968}