Revert of wtf/CheckedArithmetic.h delegates to base/numerics/safe_math.h.

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp

 /*
  * Copyright (c) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebCompositorSupport.h"
 #include "public/platform/WebExternalBitmap.h"
 #include "public/platform/WebExternalTextureLayer.h"
 #include "public/platform/WebGraphicsContext3D.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
 #include "wtf/ArrayBufferContents.h"
-#include "wtf/CheckedNumeric.h"
 #include <algorithm>
 #ifndef NDEBUG
 #include "wtf/RefCountedLeakCounter.h"
 #endif
 
 namespace blink {
 
 namespace {
 
 const float s_resourceAdjustedRatio = 0.5;
@@ skipping 807 matching lines @@
 {
     m_packAlignment = param;
 }
 
 bool DrawingBuffer::paintRenderingResultsToImageData(int& width, int& height, SourceDrawingBuffer sourceBuffer, WTF::ArrayBufferContents& contents)
 {
     ASSERT(!m_actualAttributes.premultipliedAlpha);
     width = size().width();
     height = size().height();
 
-    CheckedNumeric<int> dataSize = 4;
+    Checked<int, RecordOverflow> dataSize = 4;
     dataSize *= width;
     dataSize *= height;
-    if (!dataSize.IsValid())
+    if (dataSize.hasOverflowed())
         return false;
 
     WTF::ArrayBufferContents pixels(width * height, 4, WTF::ArrayBufferContents::NotShared, WTF::ArrayBufferContents::DontInitialize);
 
     GLint fbo = 0;
     if (sourceBuffer == FrontBuffer && m_frontColorBuffer.texInfo.textureId) {
         fbo = m_context->createFramebuffer();
         m_gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
         m_gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_frontColorBuffer.texInfo.parameters.target, m_frontColorBuffer.texInfo.textureId, 0);
     } else {
@@ skipping 151 matching lines @@
 
     if (m_antiAliasingMode == MSAAImplicitResolve)
         m_gl->FramebufferTexture2DMultisampleEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target, m_colorBuffer.textureId, 0, m_sampleCount);
     else
         m_gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target, m_colorBuffer.textureId, 0);
 
     m_gl->BindTexture(GL_TEXTURE_2D, m_texture2DBinding);
 }
 
 } // namespace blink