Revert "SkTypes.h : move SkAutoMalloc into SkAutoMalloc.h"

Revert "SkTypes.h : move SkAutoMalloc into SkAutoMalloc.h"

This reverts commit a5494f117086d712855e4b6289c58c92d1549bcf.

Reason for revert: Broke Google3

Original change's description:
> SkTypes.h : move SkAutoMalloc into SkAutoMalloc.h
>
>   * SkAutoFree moved to SkTemplates.h (now implmented with unique_ptr).
>
>   * SkAutoMalloc and SkAutoSMalloc moved to SkAutoMalloc.h
>
>   * "SkAutoFree X(sk_malloc_throw(N));" --> "SkAutoMalloc X(N);"
>
> Change-Id: Idacd86ca09e22bf092422228599ae0d9bedded88
> Reviewed-on: https://skia-review.googlesource.com/4543
> Reviewed-by: Ben Wagner <bungeman@google.com>
> Reviewed-by: Mike Reed <reed@google.com>
> Commit-Queue: Hal Canary <halcanary@google.com>
>

TBR=halcanary@google.com,bungeman@google.com,reed@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: Ie8bd176121c3ee83c110d66c0d0ac65e09bfc9c5
Reviewed-on: https://skia-review.googlesource.com/6884
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>