Move file validation util methods from chrome/ to components/

Bug: 758690
Change-Id: I462d4e70518c7e4826eaffa903b61f68df38b7b4
Reviewed-on: https://chromium-review.googlesource.com/853200
Commit-Queue: Jian Li <[email protected]>
Reviewed-by: Adam Langley <[email protected]>
Reviewed-by: Peter Williamson <[email protected]>
Cr-Commit-Position: refs/heads/master@{#527478}
9 files changed