GTK: Make the gtk port compile with GTK_DISABLE_SINGLE_INCLUDES.

ui/base/gtk/gtk_floating_container.cc

Index: ui/base/gtk/gtk_floating_container.cc
diff --git a/ui/base/gtk/gtk_floating_container.cc b/ui/base/gtk/gtk_floating_container.cc
index 0bda427e41f0823557dc893e882a0933ab001230..8ba85440c7d15098602e2c867d6e6de980eaa776 100644
--- a/ui/base/gtk/gtk_floating_container.cc
+++ b/ui/base/gtk/gtk_floating_container.cc
@@ -5,8 +5,6 @@
 #include "ui/base/gtk/gtk_floating_container.h"
 
 #include <gtk/gtk.h>
-#include <gtk/gtkmarshal.h>
-#include <gtk/gtkprivate.h>
 
 #include <algorithm>
 
@@ -39,6 +37,9 @@ GtkFloatingContainerChild* GetChild(GtkFloatingContainer* container,
   return NULL;
 }
 
+const GParamFlags kStaticReadWriteProp = static_cast<GParamFlags>(
+    G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+
 }  // namespace
 
 G_BEGIN_DECLS
@@ -97,7 +98,7 @@ static void gtk_floating_container_class_init(
                        G_MININT,
                        G_MAXINT,
                        0,
-                       static_cast<GParamFlags>(GTK_PARAM_READWRITE)));
+                       kStaticReadWriteProp));
 
   gtk_container_class_install_child_property(
       container_class,
@@ -108,7 +109,7 @@ static void gtk_floating_container_class_init(
                        G_MININT,
                        G_MAXINT,
                        0,
-                       static_cast<GParamFlags>(GTK_PARAM_READWRITE)));
+                       kStaticReadWriteProp));
 
   floating_container_signals[SET_FLOATING_POSITION] =
       g_signal_new("set-floating-position",