DIP <=> pixel conversions in Chromium are wrong

[bbondy]

Instead of multiplying and dividing by 1.75 for 175% DPI, we should be using PhysicalToLogicalPointForPerMonitorDPI and PhysicalToLogicalPointForPerMonitorDPI
https://msdn.microsoft.com/en-us/library/windows/desktop/dn469266(v=vs.85).aspx

See also the discussion here:
brave/browser-laptop#8472

Which avoids a conversion to and from DIP when the transformed point does not change. Currently the conversion from and to int points result in the points that can be off by a pixel or 2.

See content/browser/renderer_host/dip_util.cc and gfx::ConvertPointToDIP and gfx::ConvertSizeToPixel