AppCaches which belong to hosted apps are not protected from deletion

chrome/browser/profiles/profile.cc

Index: chrome/browser/profiles/profile.cc
diff --git a/chrome/browser/profiles/profile.cc b/chrome/browser/profiles/profile.cc
index ab8534d2c35bc8a4e7532880b3558b39aaeaff6e..9645d1149fd025b10715e831e0f07ed29af69477 100644
--- a/chrome/browser/profiles/profile.cc
+++ b/chrome/browser/profiles/profile.cc
@@ -761,8 +761,7 @@ class OffTheRecordProfileImpl : public Profile,
             IsOffTheRecord()
                 ? FilePath() : GetPath().Append(chrome::kAppCacheDirname),
             &GetResourceContext(),
-            make_scoped_refptr(GetExtensionSpecialStoragePolicy()),
-            false));
+            make_scoped_refptr(GetExtensionSpecialStoragePolicy())));
   }
 
   NotificationRegistrar registrar_;
@@ -861,3 +860,7 @@ Profile* Profile::CreateOffTheRecordProfile() {
 #endif
   return new OffTheRecordProfileImpl(this);
 }
+
+base::WaitableEvent* Profile::ClearAppCache() {
+  return NULL;
+}