chrome/test: Enable ocmock deps in Mac build.
chrome/test: Enable ocmock deps in Mac build.

This target has been converted to GN build already.

Tested on Mac with the following command lines:

$ gn gen out-gn/Debug
$ ninja -C out-gn/Debug unit_tests browser_tests ocmock

BUG=431177
TEST=see above
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/1225613002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#337763}

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