GTTF: Fix problems with contents detected by debugallocation:

content/shell/shell_gtk.cc

Index: content/shell/shell_gtk.cc
diff --git a/content/shell/shell_gtk.cc b/content/shell/shell_gtk.cc
index 25e6dd766209be217d11e8f080f566cd2df0e0e9..2a3fb6e5e5699fb5f714b7ce9b3f34bd049d75b4 100644
--- a/content/shell/shell_gtk.cc
+++ b/content/shell/shell_gtk.cc
@@ -101,6 +101,8 @@ void Shell::PlatformSetIsLoading(bool loading) {
 }
 
 void Shell::PlatformCreateWindow(int width, int height) {
+  SizeTo(width, height);
+
   if (headless_)
     return;
 
@@ -194,8 +196,6 @@ void Shell::PlatformCreateWindow(int width, int height) {
 
   gtk_container_add(GTK_CONTAINER(window_), vbox_);
   gtk_widget_show_all(GTK_WIDGET(window_));
-
-  SizeTo(width, height);
 }
 
 void Shell::PlatformSetContents() {