Update from https://crrev.com/320931

ui/gl/angle_platform_impl.h

Index: ui/gl/angle_platform_impl.h
diff --git a/ui/gl/angle_platform_impl.h b/ui/gl/angle_platform_impl.h
deleted file mode 100644
index 2d12f60b14004a96d3c1ba76ed94230f56aab807..0000000000000000000000000000000000000000
--- a/ui/gl/angle_platform_impl.h
+++ /dev/null
@@ -1,39 +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.
-
-#ifndef UI_GL_ANGLE_PLATFORM_IMPL_H_
-#define UI_GL_ANGLE_PLATFORM_IMPL_H_
-
-// Implements the ANGLE platform interface, for functionality like
-// histograms and trace profiling.
-
-#include "base/macros.h"
-#include "third_party/angle/include/platform/Platform.h"
-
-namespace gfx {
-
-// Derives the base ANGLE platform and provides implementations
-class ANGLEPlatformImpl : public angle::Platform {
- public:
-  ANGLEPlatformImpl();
-  ~ANGLEPlatformImpl() override;
-
-  // angle::Platform:
-  void histogramCustomCounts(const char* name,
-                             int sample,
-                             int min,
-                             int max,
-                             int bucket_count) override;
-  void histogramEnumeration(const char* name,
-                            int sample,
-                            int boundary_value) override;
-  void histogramSparse(const char* name, int sample) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ANGLEPlatformImpl);
-};
-
-}  // namespace gfx
-
-#endif  // UI_GL_ANGLE_PLATFORM_IMPL_H_