Bump 1080p limit of the pepper vpx software encoder to 4k/2160p
Bump 1080p limit of the pepper vpx software encoder to 4k/2160p

The old limit restricted the resolution of the software encoder to 1080p. This
change bump this limit to 4k/2160p. This can be useful to be able to use the
software encoder for higher resolutions as well. Especially from a NaCl
context, where libvpx cannot be used with assembler optimizations directly.

BUG=455409

Review URL: https://codereview.chromium.org/1408833004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#355254}

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