Update from https://crrev.com/320931

ui/gl/angle_platform_impl.cc

Index: ui/gl/angle_platform_impl.cc
diff --git a/ui/gl/angle_platform_impl.cc b/ui/gl/angle_platform_impl.cc
deleted file mode 100644
index 2ce12b823afb36bb1a3f3cb46f7e3e4c7699822f..0000000000000000000000000000000000000000
--- a/ui/gl/angle_platform_impl.cc
+++ /dev/null
@@ -1,50 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/gl/angle_platform_impl.h"
-
-#include "base/metrics/histogram.h"
-#include "base/metrics/sparse_histogram.h"
-
-namespace gfx {
-
-ANGLEPlatformImpl::ANGLEPlatformImpl() {
-}
-
-ANGLEPlatformImpl::~ANGLEPlatformImpl() {
-}
-
-void ANGLEPlatformImpl::histogramCustomCounts(const char* name,
-                                              int sample,
-                                              int min,
-                                              int max,
-                                              int bucket_count) {
-  // Copied from histogram macro, but without the static variable caching
-  // the histogram because name is dynamic.
-  base::HistogramBase* counter = base::Histogram::FactoryGet(
-      name, min, max, bucket_count,
-      base::HistogramBase::kUmaTargetedHistogramFlag);
-  DCHECK_EQ(name, counter->histogram_name());
-  counter->Add(sample);
-}
-
-void ANGLEPlatformImpl::histogramEnumeration(const char* name,
-                                             int sample,
-                                             int boundary_value) {
-  // Copied from histogram macro, but without the static variable caching
-  // the histogram because name is dynamic.
-  base::HistogramBase* counter = base::LinearHistogram::FactoryGet(
-      name, 1, boundary_value, boundary_value + 1,
-      base::HistogramBase::kUmaTargetedHistogramFlag);
-  DCHECK_EQ(name, counter->histogram_name());
-  counter->Add(sample);
-}
-
-void ANGLEPlatformImpl::histogramSparse(const char* name, int sample) {
-  // For sparse histograms, we can use the macro, as it does not incorporate a
-  // static.
-  UMA_HISTOGRAM_SPARSE_SLOWLY(name, sample);
-}
-
-}  // namespace gfx