henrik.lundin 79dfdadbc8 Avoid left-shifting negative values in a number of places
This is undefined behavior, according to specification.

BUG=chromium:661133

Review-Url: https://codereview.webrtc.org/2500953003
Cr-Commit-Position: refs/heads/master@{#15078}
2016-11-15 09:45:59 +00:00
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