Produces a build warning in standalone, might require build file updates:

> locally defined symbol ANGLEPlatformInitialize imported in function <snip>

At least in GYP, libEGL does not have LIBANGLE_IMPLEMENTATION defined, so it defines this API with __declspec(dllimport), which is incorrect, since the function is local to the module. We should fix the layering and/or export defs.

BUG=angleproject:1621

This reverts commit 0504fcc1.

Change-Id: Ida67db69eb64e4a8f2c13dcf129d40b332f2da9d
Reviewed-on: https://chromium-review.googlesource.com/410065Reviewed-by: Jamie Madill <jmadill@chromium.org>