Replace hide-scrollbars flag with a web setting.

chromecast/browser/cast_browser_main_parts.cc

Index: chromecast/browser/cast_browser_main_parts.cc
diff --git a/chromecast/browser/cast_browser_main_parts.cc b/chromecast/browser/cast_browser_main_parts.cc
index e4a77cac9e1f3b8e77bfb928b120c18d997ba051..22df7643d29d8ef8f303780d6314dfff2fe0b782 100644
--- a/chromecast/browser/cast_browser_main_parts.cc
+++ b/chromecast/browser/cast_browser_main_parts.cc
@@ -61,7 +61,6 @@
 #include "media/base/media.h"
 #include "media/base/media_switches.h"
 #include "ui/compositor/compositor_switches.h"
-#include "ui/native_theme/native_theme_switches.h"
 
 #if !defined(OS_ANDROID)
 #include <signal.h>
@@ -245,7 +244,6 @@ DefaultCommandLineSwitch g_default_switches[] = {
   // Enable navigator.connection API.
   // TODO(derekjchow): Remove this switch when enabled by default.
   { switches::kEnableNetworkInformation, "" },
-  { switches::kHideScrollbars, "" },
   { NULL, NULL },  // Termination
 };