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This reverts commit 77c59a87.

Reason for revert: Broke build. See the comment on the original review.

Original change's description:
> Mojo EDK: Refactor layered message serialization
> 
> Consolidates and simplifies user message serialization within the EDK.
> Namely:
> 
>   * The ports layer no longer operates under the assumption that all
>   events exist exclusively in serialized form. This eliminates the
>   complexity of layered message allocation at the cost of a small amount
>   of extra copying in some cases.
> 
>   * ports::Message is now more aptly named ports::Event, and different
>   event types are subclasses.
> 
>   * Introduces a ports::UserMessage base class for ports embedder
>   message types. These can be attached to ports::UserMessageEvent
>   objects.
> 
>   * The MessageForTransit and PortsMessage types have been flattened
>   into a single UserMessageImpl type, a subclass of ports::UserMessage.
> 
>   * Nearly all user message serialization and deserialization logic has
>   been consolidated into UserMessageImpl. A few small pieces remain
>   isolated in node_controller.cc and will eventually move elsewhere
>   after additional refactoring.
> 
> All of this work is a precursor to supporting lazy serialization.
> 
> BUG=725321
> 
> Change-Id: Ib9e66cd0d5b88ac0e6dc898f248c958039078023
> Reviewed-on: https://chromium-review.googlesource.com/516402
> Commit-Queue: Ken Rockot <rockot@chromium.org>
> Reviewed-by: Jay Civelli <jcivelli@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#475731}

TBR=jcivelli@chromium.org,rockot@chromium.org
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
BUG=725321

Change-Id: I84f950290e6c45dc830f2bc3177af09ae955f432
Reviewed-on: https://chromium-review.googlesource.com/518742Reviewed-by: Takeshi Yoshino <tyoshino@chromium.org>
Commit-Queue: Takeshi Yoshino <tyoshino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#475805}