Gtk: Change NULL to nullptr

chrome/browser/ui/libgtkui/gtk_util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_LIBGTKUI_GTK_UTIL_H_
 #define CHROME_BROWSER_UI_LIBGTKUI_GTK_UTIL_H_
 
 #include <gtk/gtk.h>
 #include <string>
 
@@ skipping 48 matching lines @@
 GdkModifierType GetGdkModifierForAccelerator(
     const ui::Accelerator& accelerator);
 
 // Translates event flags into plaform independent event flags.
 int EventFlagsFromGdkState(guint state);
 
 // Style a GTK button as a BlueButton
 void TurnButtonBlue(GtkWidget* button);
 
 // Sets |dialog| as transient for |parent|, which will keep it on top and center
-// it above |parent|. Do nothing if |parent| is NULL.
+// it above |parent|. Do nothing if |parent| is nullptr.
 void SetGtkTransientForAura(GtkWidget* dialog, aura::Window* parent);
 
 // Gets the transient parent aura window for |dialog|.
 aura::Window* GetAuraTransientParent(GtkWidget* dialog);
 
 // Clears the transient parent for |dialog|.
 void ClearAuraTransientParent(GtkWidget* dialog);
 
 #if GTK_MAJOR_VERSION > 2
 // These constants are defined in gtk/gtkenums.h in Gtk3.12 or later.
@@ skipping 90 matching lines @@
       g_object_unref(context);
       return;
     }
     context = parent;
   }
 }
 
 typedef ScopedGObject<GtkStyleContext> ScopedStyleContext;
 typedef ScopedGObject<GtkCssProvider> ScopedCssProvider;
 
-// If |context| is NULL, creates a new top-level style context
+// If |context| is nullptr, creates a new top-level style context
 // specified by parsing |css_node|.  Otherwise, creates the child
 // context with |context| as the parent.
 ScopedStyleContext AppendCssNodeToStyleContext(GtkStyleContext* context,
                                                const std::string& css_node);
 
 // Parses |css_selector| into a GtkStyleContext.  The format is a
 // sequence of whitespace-separated objects.  Each object may have at
 // most one object name at the beginning of the string, and any number
 // of '.'-prefixed classes and ':'-prefixed pseudoclasses.  An example
 // is "GtkButton.button.suggested-action:hover:active".  The caller
@@ skipping 29 matching lines @@
 SkColor GetSelectedTextColor(const char* css_selector);
 SkColor GetSelectedBgColor(const char* css_selector);
 
 // Get the color of the GtkSeparator specified by |css_selector|.
 SkColor GetSeparatorColor(const char* css_selector);
 #endif
 
 }  // namespace libgtkui
 
 #endif  // CHROME_BROWSER_UI_LIBGTKUI_GTK_UTIL_H_