Revert "Enable testing on both master and stable (#2197)" (#2199)
Revert "Enable testing on both master and stable (#2197)" (#2199)

This reverts commit c155379d137603821410a0851ff691713b5ba38b.
flutter/plugins,tvolkert/plugins,flutter/plugins,tvolkert/plugins,flutter/plugins,mehmetf/plugins,mehmetf/plugins,tvolkert/plugins,mehmetf/plugins,flutter/plugins,mehmetf/plugins,flutter/plugins,mehmetf/plugins,flutter/plugins,tvolkert/plugins,flutter/plugins,flutter/plugins