This reverts commit c4b1fbd6.

Reason for revert: https://crbug.com/1003971

Original change's description:
> EGL: Implement EGL_KHR_no_config_context
> 
> Add extension string and flag to all renderers that pass
> Modify eglCreateContext to accept EGL_NO_CONFIG
> Modify eglQueryContext per specification
> Modify eglMakeCurrent to bypass surface-context config compatibility checks
> Add check for client API
> Create new end2end test EGLNoConfigContextTest
> Disable on most renderers to prevent possible fail with future configs
> 
> Bug: angleproject:3635
> Test: dEQP-EGL.functional.create_context.no_config*
>       angle_end2end_tests --gtest_filter=EGLNoConfigContextTest*
> Change-Id: I7fbb137f1222ae7eebff4192013b7d3c5fcf0436
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1762709
> Commit-Queue: Mohan Maiya <m.maiya@samsung.com>
> Reviewed-by: Geoff Lang <geofflang@chromium.org>

TBR=geofflang@chromium.org,timvp@google.com,jmadill@chromium.org,m.maiya@samsung.com,j.vigil@samsung.com

Change-Id: I849aa796803e3cda9b480a39be813ef9105325bb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: angleproject:3635
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1803789Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>