test: Remove EGLSingleBufferTest.VerifyMutableRenderBufferKHR The test is enforcing that specifying/querying EGL_SINGLE_BUFFER requires the extension EGL_KHR_mutable_render_buffer. However, EGL_RENDER_BUFFER/EGL_SINGLE_BUFFER were introduced in EGL 1.4, removing any extension requirements for devices that support EGL 1.4+. 3.5 Rendering Surfaces 3.5.1 Creating On-Screen Rendering Surfaces ... EGL_RENDER_BUFFER specifies which buffer should be used by default for client API rendering to the window, as described in section 2.2.2. If its value is EGL_SINGLE_BUFFER, then client APIs should render directly into the visible window. If its value is EGL_BACK_BUFFER, then all client APIs should render into the back buffer. The default value of EGL_RENDER_BUFFER is EGL_BACK_- BUFFER The extension itself requires a minimum of EGL 1.2, meaning only versions 1.2 and 1.3 require EGL_KHR_mutable_render_buffer to use EGL_SINGLE_BUFFER. Remove the test since it doesn't gives us any information anymore since we always expose EGL 1.5 anyway. Bug: b/417459061 Change-Id: I060e196600e6ece6179a164d9125a8b98c0d8498 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6613123 Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Tim Van Patten <timvp@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>