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The _ANGLE version of the ANGLE libraries were loadable_module targets
linking against their respective shared_library. It worked in Debug
build but in Release builds the --as-needed linker flag removed the
dependency. Release Chromium would then be enable to find
eglGetProcAddress in libEGL_ANGLE and fail to start the GPU process.

This commit replaces the loadable_module scheme by a simple copy of the
libEGL and libGLESv2 shared libraries from PRODUCT_DIR/lib to
PRODUCT_DIR. The drawback to doing this is that the GYP and GN code
diverge (there is no need for the copy in GN).

BUG=522967

Review URL: https://codereview.chromium.org/1635243002

Cr-Commit-Position: refs/heads/master@{#371821}