GL: Temporarily disable emulatePrimitiveRestartFixedIndex.

This workaround appears to cause problems on Mac ASAN builds.
Disabling it while investigating the root cause.

BUG=1017337
BUG=angleproject:3997

Change-Id: I16a2f07f8fc69ec4d5ab40a5bf521c43f6854a49
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1879873
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

src/libANGLE/renderer/gl/renderergl_utils.cpp

@@ -1575,10 +1575,6 @@ void InitializeFeatures(const FunctionsGL *functions, angle::FeaturesGL *feature
 
     ANGLE_FEATURE_CONDITION(features, rgbDXT1TexturesSampleZeroAlpha, IsApple());
 
-    ANGLE_FEATURE_CONDITION(
-        features, emulatePrimitiveRestartFixedIndex,
-        !functions->isAtLeastGL(gl::Version(4, 3)) && !functions->isAtLeastGLES(gl::Version(3, 0)));
-
     ANGLE_FEATURE_CONDITION(features, unfoldShortCircuits, IsApple());
 
     ANGLE_FEATURE_CONDITION(features, removeDynamicIndexingOfSwizzledVector,