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And Move api_resource_manager_unittest.cc to extensions_unittests to pass the unittest.(by using ExtensionsTest)

BUG=397164, 354046
TEST=extensions_unittests

Review URL: https://codereview.chromium.org/431023003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287485 0039d316-1c4b-4281-b951-d872f2087c98