Remove windows/mac/ios specific code from //ui

ui/gfx/animation/tween_unittest.cc

 // Copyright 2013 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/animation/tween.h"
 
 #include <math.h>
 
-#if defined(OS_WIN)
-#include <float.h>
-#endif
-
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/test/gfx_util.h"
 
 namespace gfx {
 namespace {
 
 double next_double(double d) {
-#if defined(OS_WIN)
-  return _nextafter(d, d + 1);
-#else
   // Step two units of least precision towards positive infinity. On some 32
   // bit x86 compilers a single step was not enough due to loss of precision in
   // optimized code.
   return nextafter(nextafter(d, d + 1), d + 1);
-#endif
 }
 
 // Validates that the same interpolations are made as in Blink.
 TEST(TweenTest, ColorValueBetween) {
   // From blink's AnimatableColorTest.
   EXPECT_SKCOLOR_EQ(0xFF00FF00,
                   Tween::ColorValueBetween(-10.0, 0xFF00FF00, 0xFF00FF00));
   EXPECT_SKCOLOR_EQ(0xFF00FF00,
                   Tween::ColorValueBetween(-10.0, 0xFF00FF00, 0xFFFF00FF));
   EXPECT_SKCOLOR_EQ(0xFF00FF00,
@@ skipping 92 matching lines @@
   EXPECT_EQ(-1, Tween::LinearIntValueBetween(2.5 / 4.0, -2, 0));
   EXPECT_EQ(-1, Tween::LinearIntValueBetween(2.99 / 4.0, -2, 0));
 
   EXPECT_EQ(0, Tween::LinearIntValueBetween(3.0 / 4.0, -2, 0));
   EXPECT_EQ(0, Tween::LinearIntValueBetween(3.5 / 4.0, -2, 0));
   EXPECT_EQ(0, Tween::LinearIntValueBetween(4.0 / 4.0, -2, 0));
 }
 
 }  // namespace
 }  // namespace gfx