ui: Prefer +/- operators to apply offsets.

ui/gfx/point_unittest.cc

 // Copyright (c) 2012 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/gfx/point_base.h"
 
 #include "base/basictypes.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/point_conversions.h"
@@ skipping 56 matching lines @@
     { Point(-10, 9), a - v1 + v2 }
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i)
     EXPECT_EQ(tests[i].expected.ToString(), tests[i].actual.ToString());
 }
 
 TEST(PointTest, OffsetFromPoint) {
   Point a(1, 5);
   Point b(-20, 8);
-  EXPECT_EQ(Vector2d(-20 - 1, 8 - 5).ToString(), b.OffsetFrom(a).ToString());
   EXPECT_EQ(Vector2d(-20 - 1, 8 - 5).ToString(), (b - a).ToString());
 }
 
 TEST(PointTest, ToRoundedPoint) {
   EXPECT_EQ(Point(0, 0), ToRoundedPoint(PointF(0, 0)));
   EXPECT_EQ(Point(0, 0), ToRoundedPoint(PointF(0.0001f, 0.0001f)));
   EXPECT_EQ(Point(0, 0), ToRoundedPoint(PointF(0.4999f, 0.4999f)));
   EXPECT_EQ(Point(1, 1), ToRoundedPoint(PointF(0.5f, 0.5f)));
   EXPECT_EQ(Point(1, 1), ToRoundedPoint(PointF(0.9999f, 0.9999f)));
 
@@ skipping 26 matching lines @@
   zero.Scale(3, 1.5);
 
   one.Scale(2);
   one.Scale(3, 1.5);
 
   EXPECT_EQ(PointF().ToString(), zero.ToString());
   EXPECT_EQ(PointF(6, -3).ToString(), one.ToString());
 }
 
 }  // namespace gfx