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CustomFrameView::IconSize() returns the size of the window icon. On Windows,
the value is obtained from GetSystemMetrics(SM_CYSMICON) call, but the problem
is that the value returned is in pixel, not in dip. This leads to a wrong sized
window icon if an user is using a higher scale ratio. This CL replaces
GetSystemMetrics() with display::win::GetSystemMetricsInDIP() to fix this.

BUG=631488
TEST=See the bug page for the reproduce steps

Review-Url: https://codereview.chromium.org/2190593002
Cr-Commit-Position: refs/heads/master@{#408290}