Swap the mac debug builder to ninja.
Swap the mac debug builder to ninja.

The normal xcodebuild was hanging.

TBR=thakis

Review URL: https://chromiumcodereview.appspot.com/10560026

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@142610 0039d316-1c4b-4281-b951-d872f2087c98

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