Revert svn 189837 "Added header dependencies support."

The NoProblemsDependencies.modularize test is failing on many buildbots.
I have also reverted the change in 189904 to disable that test for MSVC.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@189957 91177308-0d34-0410-b5e6-96231b3b80d8