Delegating the "are images allowed" decision to renderer.

chrome/renderer/chrome_render_process_observer.h

Index: chrome/renderer/chrome_render_process_observer.h
diff --git a/chrome/renderer/chrome_render_process_observer.h b/chrome/renderer/chrome_render_process_observer.h
index 80bf18ef8767cfc03af24d8d6a9d09d3ac2ebac6..718cc1b8df1fb4a1d798719fcf014b9df18f492c 100644
--- a/chrome/renderer/chrome_render_process_observer.h
+++ b/chrome/renderer/chrome_render_process_observer.h
@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
+#include "chrome/common/content_settings.h"
 #include "content/renderer/render_process_observer.h"
 
 namespace chrome {
@@ -42,6 +43,7 @@ class ChromeRenderProcessObserver : public RenderProcessObserver {
   void OnSetContentSettingsForCurrentURL(
       const GURL& url, const ContentSettings& content_settings);
   void OnSetDefaultContentSettings(const ContentSettings& content_settings);
+  void OnSetImageSettingRules(const ContentSettingsForOneType& settings);
   void OnSetCacheCapacities(size_t min_dead_capacity,
                             size_t max_dead_capacity,
                             size_t capacity);