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This is a reland of 7a5a390d

Original change's description:
> Remove CacheStorage mojom typemaps.
> 
> This CL removes the typemaps for CacheStorage and converts the browser usage of
> CacheStorage types to mojo types.
> 
> Bug: 612287
> Change-Id: Ied68ed00f2cc7af71cc33660544be9894cbb2eb1
> Reviewed-on: https://chromium-review.googlesource.com/1058334
> Reviewed-by: Joshua Bell <jsbell@chromium.org>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Commit-Queue: Lucas Gadani <lfg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#559058}

Bug: 612287
Change-Id: Iea6d8ef4f67616be7350edec7705d71b2b1ac126
Reviewed-on: https://chromium-review.googlesource.com/1061986Reviewed-by: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Lucas Gadani <lfg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559406}