Remove problematic-and-ignored ALIGNAS(4)
Remove problematic-and-ignored ALIGNAS(4)

VC++ 2015 says:
    warning C4359: 'mojo::edk::TokenSerializerMessage': Alignment
    specifier is less than actual alignment (8), and will be ignored.

This is because TokenSerializerMessage contains a uint64_t member which,
on VC++ builds (even 32-bit builds) is 8-byte aligned by the compiler.
The __declspec(align()) directives can increase alignment requirements
but they cannot decrease them. Therefore the directive is ignored.

The directive is also ignored in VC++ 2013, but there it is ignored
silently. See the bug for details.

MSDN explicitly says:
    __declspec(align(#)) can only increase alignment restrictions.

BUG=561697,440500

Review URL: https://codereview.chromium.org/1482553002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#361806}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk