GTK: More signal macro usage.

chrome/browser/gtk/gtk_theme_provider.h

Index: chrome/browser/gtk/gtk_theme_provider.h
diff --git a/chrome/browser/gtk/gtk_theme_provider.h b/chrome/browser/gtk/gtk_theme_provider.h
index 17059bbb9fdfdcdd5db99f0d71d3570b973fa40b..aca0cd9c3adcb82458bb1654875f42dcd0830600 100644
--- a/chrome/browser/gtk/gtk_theme_provider.h
+++ b/chrome/browser/gtk/gtk_theme_provider.h
@@ -130,11 +130,6 @@ class GtkThemeProvider : public BrowserThemeProvider,
   // Additionally frees the CairoCachedSurfaces.
   virtual void FreePlatformCaches();
 
-  // Handles signal from GTK that our theme has been changed.
-  static void OnStyleSet(GtkWidget* widget,
-                         GtkStyle* previous_style,
-                         GtkThemeProvider* provider);
-
   // Extracts colors and tints from the GTK theme, both for the
   // BrowserThemeProvider interface and the colors we send to webkit.
   void LoadGtkValues();
@@ -178,6 +173,9 @@ class GtkThemeProvider : public BrowserThemeProvider,
   // entry.
   void GetSelectedEntryForegroundHSL(color_utils::HSL* tint) const;
 
+  // Handles signal from GTK that our theme has been changed.
+  CHROMEGTK_CALLBACK_1(GtkThemeProvider, void, OnStyleSet, GtkStyle*);
+
   // A notification from the GtkChromeButton GObject destructor that we should
   // remove it from our internal list.
   CHROMEGTK_CALLBACK_0(GtkThemeProvider, void, OnDestroyChromeButton);