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1. Remove the dead code in ReallocateSwapChain().
2. Handling software protected video separately in
GetSwapChainFormat() gets the same result. Remove it.
3. The purpose of retrying YUV format after swap chain resizing was to
see if it would show a better hardware overlay promotion rate in UMA.
Remove it since we didn't get a better result. It still get a chance to
switch back to YUV if the majority in |presentation_history_| are
overlay mode.

Bug: 1117235
Change-Id: Iff2e5666d3895fefa6e5289fe92b09a56ffd82ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499324Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820820}