GitLab

Most of these tests are testing conformance for TypedArrays, ArrayBuffer,
bufferData, and some basic WebGL functions. I believe all these tests
are upstreamed in Github, so there is no reason to keep it here.

Note that I didn't delete all tests under this dir, only the ones I
can quickly locate its duplicates on conformance test suite.

BUG=none

Review-Url: https://codereview.chromium.org/2447493002
Cr-Commit-Position: refs/heads/master@{#427194}