Accessible bounds should include device scale factor on Windows.

content/browser/accessibility/browser_accessibility_win.h

Index: content/browser/accessibility/browser_accessibility_win.h
diff --git a/content/browser/accessibility/browser_accessibility_win.h b/content/browser/accessibility/browser_accessibility_win.h
index 7b454d6c75e33a2ba9071146eeb0d81f7e300248..18a73ac6d835730539e2c56eafd6e65ca58fb9fa 100644
--- a/content/browser/accessibility/browser_accessibility_win.h
+++ b/content/browser/accessibility/browser_accessibility_win.h
@@ -750,6 +750,12 @@ BrowserAccessibilityWin
   }
 
  private:
+  // Override the bounds calculation to take the device scale factor
+  // into account, which doesn't need to be done on all platforms.
+  CONTENT_EXPORT gfx::Rect RelativeToAbsoluteBounds(
+      gfx::RectF bounds,
+      bool frame_only) const override;
+
   // Returns the IA2 text attributes for this object.
   std::vector<base::string16> ComputeTextAttributes() const;