Fix a crash that happens when changing themes.

chrome/browser/gtk/nine_box.cc

Index: chrome/browser/gtk/nine_box.cc
diff --git a/chrome/browser/gtk/nine_box.cc b/chrome/browser/gtk/nine_box.cc
index ba1b856c07faef91e123033e25be0e452260fe1d..af2de6186968151c785f535f19bae314abaa18d0 100644
--- a/chrome/browser/gtk/nine_box.cc
+++ b/chrome/browser/gtk/nine_box.cc
@@ -6,9 +6,11 @@
 
 #include "app/resource_bundle.h"
 #include "app/theme_provider.h"
+#include "base/basictypes.h"
 #include "base/gfx/gtk_util.h"
 #include "base/gfx/point.h"
 #include "base/logging.h"
+#include "chrome/common/notification_service.h"
 
 namespace {
 
@@ -45,25 +47,25 @@ NineBox::NineBox(int top_left, int top, int top_right, int left, int center,
 
 NineBox::NineBox(ThemeProvider* theme_provider,
                  int top_left, int top, int top_right, int left, int center,
-                 int right, int bottom_left, int bottom, int bottom_right) {
-  images_[0] = top_left ?
-               theme_provider->GetPixbufNamed(top_left) : NULL;
-  images_[1] = top ?
-               theme_provider->GetPixbufNamed(top) : NULL;
-  images_[2] = top_right ?
-               theme_provider->GetPixbufNamed(top_right) : NULL;
-  images_[3] = left ?
-               theme_provider->GetPixbufNamed(left) : NULL;
-  images_[4] = center ?
-               theme_provider->GetPixbufNamed(center) : NULL;
-  images_[5] = right ?
-               theme_provider->GetPixbufNamed(right) : NULL;
-  images_[6] = bottom_left ?
-               theme_provider->GetPixbufNamed(bottom_left) : NULL;
-  images_[7] = bottom ?
-               theme_provider->GetPixbufNamed(bottom) : NULL;
-  images_[8] = bottom_right ?
-               theme_provider->GetPixbufNamed(bottom_right) : NULL;
+                 int right, int bottom_left, int bottom, int bottom_right)
+    : theme_provider_(theme_provider) {
+  image_ids_[0] = top_left;
+  image_ids_[1] = top;
+  image_ids_[2] = top_right;
+  image_ids_[3] = left;
+  image_ids_[4] = center;
+  image_ids_[5] = right;
+  image_ids_[6] = bottom_left;
+  image_ids_[7] = bottom;
+  image_ids_[8] = bottom_right;
+
+  // Load images by pretending that we got a BROWSER_THEME_CHANGED
+  // notification.
+  Observe(NotificationType::BROWSER_THEME_CHANGED,
+          NotificationService::AllSources(),
+          NotificationService::NoDetails());
+  registrar_.Add(this, NotificationType::BROWSER_THEME_CHANGED,
+                 NotificationService::AllSources());
 }
 
 NineBox::~NineBox() {
@@ -177,3 +179,17 @@ void NineBox::ContourWidget(GtkWidget* widget) const {
   g_object_unref(mask);
   cairo_destroy(cr);
 }
+
+void NineBox::Observe(NotificationType type, const NotificationSource& source,
+                      const NotificationDetails& details) {
+  if (NotificationType::BROWSER_THEME_CHANGED != type) {
+    NOTREACHED();
+    return;
+  }
+
+  // Reload images.
+  for (size_t i = 0; i < arraysize(image_ids_); ++i) {
+    images_[i] = image_ids_[i] ?
+                 theme_provider_->GetPixbufNamed(image_ids_[i]) : NULL;
+  }
+}