Set mergeRequests=False in tryserver master config for builders.pyl.
Set mergeRequests=False in tryserver master config for builders.pyl.

R=nodir@chromium.org
BUG=491265

Review URL: https://codereview.chromium.org/1150313004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@295382 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build