GetDeviceCaps doesn't need to be scaled.

chrome/browser/metrics/metrics_log.cc

Index: chrome/browser/metrics/metrics_log.cc
diff --git a/chrome/browser/metrics/metrics_log.cc b/chrome/browser/metrics/metrics_log.cc
index 38df09f9fe20da78ad6722cd2b70a3745f934d70..dde2e3608efbceeb9ef1e396d2e43b4302c710d6 100644
--- a/chrome/browser/metrics/metrics_log.cc
+++ b/chrome/browser/metrics/metrics_log.cc
@@ -58,7 +58,6 @@
 
 #if defined(OS_WIN)
 #include "base/win/metro.h"
-#include "ui/gfx/win/dpi.h"
 
 // http://blogs.msdn.com/oldnewthing/archive/2004/10/25/247180.aspx
 extern "C" IMAGE_DOS_HEADER __ImageBase;
@@ -305,8 +304,6 @@ BOOL CALLBACK GetMonitorDPICallback(HMONITOR, HDC hdc, LPRECT, LPARAM dwData) {
       GetDeviceCaps(hdc, HORZRES) / (size_x / kMillimetersPerInch) : 0;
   double dpi_y = (size_y > 0) ?
       GetDeviceCaps(hdc, VERTRES) / (size_y / kMillimetersPerInch) : 0;
-  dpi_x *= gfx::win::GetUndocumentedDPIScale();
-  dpi_y *= gfx::win::GetUndocumentedDPIScale();
   screen_info->max_dpi_x = std::max(dpi_x, screen_info->max_dpi_x);
   screen_info->max_dpi_y = std::max(dpi_y, screen_info->max_dpi_y);
   return TRUE;