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Same as the previous patch, but avoids assigning from a const& that
is destructed by the assignment. PS#1 is the original change, all
later patch sets are the new one.

---- [ Original Description Below ] ----

Does the following:
- Internalizes h264 and min resolution details.
- Sets the minimum resolution to 64,64 for both decoders.
- Only loops through the video device profiles once.
- Switches away from an std::pair to a named struct.
- Adds AV1 GUID values and uses them in DXVA decoder.
- Stops D3D11VideoDecoder for enumerating unsupported profiles.
- Stops using the DXVA2_Intel_ModeH264_E for enumeration.
- Gives all resolution tests a square resolution; e.g., 4k x 4k.
- Doesn't test or indicate support for a duplicate portrait resolution.

TBR=liberato, tmathmeyer

Bug: 1073252
Test: Updated unittests.
Change-Id: I0503d43630238c0a11b3a683308232f13cfdf37b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2227969Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774474}