Oilpan: Remove extensions_browsertests from WebKit Mac Oilpan
Oilpan: Remove extensions_browsertests from WebKit Mac Oilpan

extensions_browsertests is not enabled on Mac waterfall bots.
So this CL removes it from WebKit Mac Oilpan.

BUG=
TBR=phajdan@google.com

Review URL: https://codereview.chromium.org/1487963002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#362363}

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