Revert of Set scaling limit at 320 * 180 for all implementations. (patchset #2 id:20001 of https://codereview.webrtc.org/2709153002/ )
Revert of Set scaling limit at 320 * 180 for all implementations. (patchset #2 id:20001 of https://codereview.webrtc.org/2709153002/ )

Reason for revert:
Looks like webrtc_perf_test started failing on linux, mac and windows after this cl landed.

Example failure:

https://build.chromium.org/p/client.webrtc.perf/builders/Linux%20Trusty/builds/1386/steps/webrtc_perf_tests/logs/stdio

[ RUN      ] CallPerfTest.ReceivesCpuOveruseAndUnderuse
../../webrtc/call/call_perf_tests.cc:522: Failure
Value of: Wait()
  Actual: false
Expected: true
Timed out before receiving an overuse callback.
[  FAILED  ] CallPerfTest.ReceivesCpuOveruseAndUnderuse (120056 ms)

Original issue's description:
> Set scaling limit at 320 * 180 for all implementations.
>
> The MediaCodec decoder on android has trouble decoding video at
> so low resolutions. We set the limit a bit higher for all implementations
> pending a robust software fallback implementation for MediaCodec.
>
> BUG=webrtc:7206
>
> Review-Url: https://codereview.webrtc.org/2709153002
> Cr-Commit-Position: refs/heads/master@{#16798}
> Committed: https://chromium.googlesource.com/external/webrtc/+/560ddb7321f2ae42ff1eb4c79d7c65d59f61dfe2

TBR=magjed@webrtc.org,sprang@webrtc.org,kthelgason@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:7206

Review-Url: https://codereview.webrtc.org/2711913007
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#16839}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 37510bf0946afef1015eabb66a801af3ac30042a

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