Remove GrGpuTraceMarker hooks until we rethink the design

src/gpu/gl/GrGLGpu.cpp

Index: src/gpu/gl/GrGLGpu.cpp
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index 1a2896350e3077c9324a4b8e284f87136d6f3439..01a6777cebd12363ad6576cd4834c9a65fa8d85e 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -3080,28 +3080,6 @@ void GrGLGpu::xferBarrier(GrRenderTarget* rt, GrXferBarrierType type) {
     }
 }
 
-void GrGLGpu::didAddGpuTraceMarker() {
-    if (this->caps()->gpuTracingSupport()) {
-        const GrTraceMarkerSet& markerArray = this->getActiveTraceMarkers();
-        SkString markerString = markerArray.toStringLast();
-#if GR_FORCE_GPU_TRACE_DEBUGGING
-        SkDebugf("%s\n", markerString.c_str());
-#else
-        GL_CALL(PushGroupMarker(0, markerString.c_str()));
-#endif
-    }
-}
-
-void GrGLGpu::didRemoveGpuTraceMarker() {
-    if (this->caps()->gpuTracingSupport()) {
-#if GR_FORCE_GPU_TRACE_DEBUGGING
-        SkDebugf("Pop trace marker.\n");
-#else
-        GL_CALL(PopGroupMarker());
-#endif
-    }
-}
-
 GrBackendObject GrGLGpu::createTestingOnlyBackendTexture(void* pixels, int w, int h,
                                               GrPixelConfig config) const {
     GrGLuint texID;