Move SaturatedArithmetic from Blink to base

ui/gfx/geometry/vector2d.cc

Index: ui/gfx/geometry/vector2d.cc
diff --git a/ui/gfx/geometry/vector2d.cc b/ui/gfx/geometry/vector2d.cc
index aec4d28b9b0fec0f0cdebe65f9462ac68466f4f3..2b4875c39cb4a9905f2ed0699fcb9164ee8fe2d6 100644
--- a/ui/gfx/geometry/vector2d.cc
+++ b/ui/gfx/geometry/vector2d.cc
@@ -6,8 +6,8 @@
 
 #include <cmath>
 
+#include "base/numerics/saturated_arithmetic.h"
 #include "base/strings/stringprintf.h"
-#include "ui/gfx/geometry/safe_integer_conversions.h"
 
 namespace gfx {
 
@@ -16,13 +16,13 @@ bool Vector2d::IsZero() const {
 }
 
 void Vector2d::Add(const Vector2d& other) {
-  x_ = SafeAdd(other.x_, x_);
-  y_ = SafeAdd(other.y_, y_);
+  x_ = base::SaturatedAddition(other.x_, x_);
+  y_ = base::SaturatedAddition(other.y_, y_);
 }
 
 void Vector2d::Subtract(const Vector2d& other) {
-  x_ = SafeSubtract(x_, other.x_);
-  y_ = SafeSubtract(y_, other.y_);
+  x_ = base::SaturatedSubtraction(x_, other.x_);
+  y_ = base::SaturatedSubtraction(y_, other.y_);
 }
 
 int64_t Vector2d::LengthSquared() const {