Making Mac bots only run tests for xcode built tests when both is configured. So now it will do like this, depending on build type: * xcode: build all with xcode projects and run the xcode built tests. * make: build all with makefile projects and run the makefile built tests * both: build all with xcode projects, then build all with makefile projects, then run the xcode built tests only (not the makefile built ones)
Making Mac bots only run tests for xcode built tests when both is configured.
So now it will do like this, depending on build type:
* xcode: build all with xcode projects and run the xcode built tests.
* make: build all with makefile projects and run the makefile built tests
* both: build all with xcode projects, then build all with makefile projects, then run the xcode built tests only (not the makefile built ones)

BUG=None
TEST=Run on local master.

Review URL: https://webrtc-codereview.appspot.com/409001

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@1758 4adac7df-926f-26a2-2b94-8c16560cd09d

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