Enable hidpi on Linux, refactor a bit on Windows to share

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 4a0c1d3c6515d6391ad653bc4183fb9da6875c03..7f956f1f192fdf99def74c2865ceec96bea67eef 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -69,6 +69,9 @@ const char kDebugPluginLoading[] = "debug-plugin-loading";
 const char kDefaultTileWidth[]              = "default-tile-width";
 const char kDefaultTileHeight[]             = "default-tile-height";
 
+// Device scale factor passed to certain processes like renderers, etc.
+const char kDeviceScaleFactor[]     = "device-scale-factor";
+
 // Disable antialiasing on 2d canvas.
 const char kDisable2dCanvasAntialiasing[]   = "disable-canvas-aa";
 
@@ -943,9 +946,6 @@ const char kDisableCoreAnimationPlugins[] =
 #endif
 
 #if defined(OS_WIN)
-// Device scale factor passed to certain processes like renderers, etc.
-const char kDeviceScaleFactor[]     = "device-scale-factor";
-
 // Disable the Legacy Window which corresponds to the size of the WebContents.
 const char kDisableLegacyIntermediateWindow[] = "disable-legacy-window";