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This reverts commit 1bdfba58.

Reason for revert: broke fuchsia
Original change's description:
> Introduce public PlatformHandle type
> 
> Adds mojo/public/cpp/platform to the public library. This includes
> a new PlatformHandle type, a thin C++ abstraction for platform-specific
> scoped handle values.
> 
> This is a precursor to moving platform channel C++ types out of the EDK
> and into the public library, and ultimately introducing a public C++
> invitation API to replace the EDK invitation API.
> 
> Bug: 844764
> Change-Id: I317decc1deb8cc47eb1000a6a19022465c392d7b
> Reviewed-on: https://chromium-review.googlesource.com/1068688
> Reviewed-by: Jay Civelli <jcivelli@chromium.org>
> Commit-Queue: Ken Rockot <rockot@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#560866}

TBR=jcivelli@chromium.org,rockot@chromium.org

Change-Id: If401afe09a2e91d5e2a0035a75db5490a41259ad
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 844764
Reviewed-on: https://chromium-review.googlesource.com/1068219Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560876}