[Athena] Hack to display favicons for web activities in overview mode

athena/content/app_activity_proxy.cc

Index: athena/content/app_activity_proxy.cc
diff --git a/athena/content/app_activity_proxy.cc b/athena/content/app_activity_proxy.cc
index a5ca0f41a6c7147d07ef6d42a7f795ef05103358..4c8093297faf77ac9ac01da4c25b30d43aca19c3 100644
--- a/athena/content/app_activity_proxy.cc
+++ b/athena/content/app_activity_proxy.cc
@@ -74,6 +74,10 @@ base::string16 AppActivityProxy::GetTitle() const {
   return title_;
 }
 
+gfx::ImageSkia AppActivityProxy::GetIcon() const {
+  return gfx::ImageSkia();
+}
+
 bool AppActivityProxy::UsesFrame() const {
   return true;
 }