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

ui/gfx/display.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/display.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 89 matching lines @@
   return gfx::Insets(work_area_.y() - bounds_.y(),
                      work_area_.x() - bounds_.x(),
                      bounds_.bottom() - work_area_.bottom(),
                      bounds_.right() - work_area_.right());
 }
 
 void Display::SetScaleAndBounds(
     float device_scale_factor,
     const gfx::Rect& bounds_in_pixel) {
   Insets insets = bounds_.InsetsFrom(work_area_);
-  if (!HasForceDeviceScaleFactor()) {
-#if defined(OS_MACOSX)
-    // Unless an explicit scale factor was provided for testing, ensure the
-    // scale is integral.
-    device_scale_factor = static_cast<int>(device_scale_factor);
-#endif
+  if (!HasForceDeviceScaleFactor())
     device_scale_factor_ = device_scale_factor;
-  }
   device_scale_factor_ = std::max(1.0f, device_scale_factor_);
   bounds_ = gfx::Rect(
       gfx::ToFlooredPoint(gfx::ScalePoint(bounds_in_pixel.origin(),
                                           1.0f / device_scale_factor_)),
       gfx::ToFlooredSize(gfx::ScaleSize(bounds_in_pixel.size(),
                                         1.0f / device_scale_factor_)));
   UpdateWorkAreaFromInsets(insets);
 }
 
 void Display::SetSize(const gfx::Size& size_in_pixel) {
@@ skipping 31 matching lines @@
 
 int64 Display::InternalDisplayId() {
   return internal_display_id_;
 }
 
 void Display::SetInternalDisplayId(int64 internal_display_id) {
   internal_display_id_ = internal_display_id;
 }
 
 }  // namespace gfx