Revert "Support GL_ETC1_RGB8_OES in the OpenGL renderer." This reverts commit 20bf7034533fbd9ff57296c5f9a5b1b9e06059db. Broke GL2ExtensionTests_compressed_etc1_rgb8_texture_input_run on win bots Change-Id: I2b48aac1512d916671d41e03f0409c404d6d7c88 Reviewed-on: https://chromium-review.googlesource.com/299429 Reviewed-by: Zhenyao Mo <zmo@chromium.org> Tested-by: Zhenyao Mo <zmo@chromium.org>