gpu: Use ANDROID_native_fence_sync instead of ARM_implicit_external_sync.

components/exo/wayland/clients/client_base.cc

Index: components/exo/wayland/clients/client_base.cc
diff --git a/components/exo/wayland/clients/client_base.cc b/components/exo/wayland/clients/client_base.cc
index 5ae91368eec165e4a8fcfd12ce2b046667880c5f..634c806a9919d33f4876cd8422c63b1c0c35c68d 100644
--- a/components/exo/wayland/clients/client_base.cc
+++ b/components/exo/wayland/clients/client_base.cc
@@ -274,12 +274,11 @@ bool ClientBase::Init(const InitParams& params) {
     make_current_.reset(
         new ui::ScopedMakeCurrent(gl_context_.get(), gl_surface_.get()));
 
-    if (gl::GLSurfaceEGL::HasEGLExtension("EGL_EXT_image_flush_external") ||
-        gl::GLSurfaceEGL::HasEGLExtension("EGL_ARM_implicit_external_sync")) {
-      egl_sync_type_ = EGL_SYNC_FENCE_KHR;
-    }
+    DCHECK(gl::GLSurfaceEGL::HasEGLExtension("EGL_KHR_fence_sync"));
     if (gl::GLSurfaceEGL::HasEGLExtension("EGL_ANDROID_native_fence_sync")) {
       egl_sync_type_ = EGL_SYNC_NATIVE_FENCE_ANDROID;
+    } else {
+      egl_sync_type_ = EGL_SYNC_FENCE_KHR;
     }
 
     native_interface = sk_sp<const GrGLInterface>(GrGLCreateNativeInterface());