Backed out changeset 24ee4a5af7e8 (bug 1136414) for test_conformance__extensions__ext-sRGB.html failures

dom/canvas/WebGLFramebuffer.cpp

@@ -268,6 +268,7 @@ WebGLContext::IsFormatValidForFB(GLenum sizedFormat) const
     case LOCAL_GL_RGBA4:
         return true;
 
+    case LOCAL_GL_SRGB8:
     case LOCAL_GL_SRGB8_ALPHA8_EXT:
         return IsExtensionEnabled(WebGLExtensionID::EXT_sRGB);