Move SaturatedArithmetic from Blink to base

third_party/WebKit/Source/core/style/ComputedStyle.cpp

Index: third_party/WebKit/Source/core/style/ComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.cpp b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
index 10aa6df78fc240a6ffca850be4fb234be7119956..865e9ccccea8565e0cb27681a82768351e032609 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
@@ -23,6 +23,7 @@
 
 #include "core/style/ComputedStyle.h"
 
+#include "base/numerics/saturated_arithmetic.h"
 #include "core/animation/css/CSSAnimationData.h"
 #include "core/animation/css/CSSTransitionData.h"
 #include "core/css/CSSPaintValue.h"
@@ -54,7 +55,6 @@
 #include "platform/transforms/TranslateTransformOperation.h"
 #include "wtf/MathExtras.h"
 #include "wtf/PtrUtil.h"
-#include "wtf/SaturatedArithmetic.h"
 #include "wtf/SizeAssertions.h"
 #include <algorithm>
 #include <memory>
@@ -2243,7 +2243,7 @@ int ComputedStyle::outlineOutsetExtent() const {
     return GraphicsContext::focusRingOutsetExtent(
         outlineOffset(), std::ceil(getOutlineStrokeWidthForFocusRing()));
   }
-  return std::max(0, saturatedAddition(outlineWidth(), outlineOffset()));
+  return std::max(0, base::SaturatedAddition(outlineWidth(), outlineOffset()));
 }
 
 float ComputedStyle::getOutlineStrokeWidthForFocusRing() const {