Updates subpixel positioning and hinting when DSF is changed

ui/gfx/font_render_params_linux.cc

Index: ui/gfx/font_render_params_linux.cc
diff --git a/ui/gfx/font_render_params_linux.cc b/ui/gfx/font_render_params_linux.cc
index 34afe6fb3ade7ee4527acfd37aabb8d19626d96d..41c8665687cb482c8bdc04b57689e24bb00da1eb 100644
--- a/ui/gfx/font_render_params_linux.cc
+++ b/ui/gfx/font_render_params_linux.cc
@@ -61,14 +61,6 @@ struct SynchronizedCache {
 base::LazyInstance<SynchronizedCache>::Leaky g_synchronized_cache =
     LAZY_INSTANCE_INITIALIZER;
 
-bool IsBrowserTextSubpixelPositioningEnabled() {
-#if defined(OS_CHROMEOS)
-  return device_scale_factor_for_internal_display > 1.0f;
-#else
-  return false;
-#endif
-}
-
 // Converts Fontconfig FC_HINT_STYLE to FontRenderParams::Hinting.
 FontRenderParams::Hinting ConvertFontconfigHintStyle(int hint_style) {
   switch (hint_style) {
@@ -186,8 +178,8 @@ uint32 HashFontRenderParamsQuery(const FontRenderParamsQuery& query) {
 
 }  // namespace
 
-FontRenderParams GetFontRenderParams(const FontRenderParamsQuery& query,
-                                     std::string* family_out) {
+FontRenderParams GetSystemFontRenderParams(const FontRenderParamsQuery& query,
+                                           std::string* family_out) {
   const uint32 hash = HashFontRenderParamsQuery(query);
   SynchronizedCache* synchronized_cache = g_synchronized_cache.Pointer();
 
@@ -220,20 +212,8 @@ FontRenderParams GetFontRenderParams(const FontRenderParamsQuery& query,
     // rendering or positioning doesn't make sense either.
     params.hinting = FontRenderParams::HINTING_FULL;
     params.subpixel_rendering = FontRenderParams::SUBPIXEL_RENDERING_NONE;
-    params.subpixel_positioning = false;
-  } else {
-    // Fontconfig doesn't support configuring subpixel positioning; check a
-    // flag.
-    params.subpixel_positioning =
-        query.for_web_contents ?
-        CommandLine::ForCurrentProcess()->HasSwitch(
-            switches::kEnableWebkitTextSubpixelPositioning) :
-        IsBrowserTextSubpixelPositioningEnabled();
-
-    // To enable subpixel positioning, we need to disable hinting.
-    if (params.subpixel_positioning)
-      params.hinting = FontRenderParams::HINTING_NONE;
   }
+  params.subpixel_positioning = false;
 
   // Use the first family from the list if Fontconfig didn't suggest a family.
   if (family_out && family_out->empty() && !query.families.empty())