Garbage Collect the Storage directory on next profile start after an extension uninstall.

content/public/browser/browser_context.h

Index: content/public/browser/browser_context.h
diff --git a/content/public/browser/browser_context.h b/content/public/browser/browser_context.h
index ff4446f3843b51eae0726f78fae2262642a48f06..5e2b37f8aa0343e2107f0a07f2b23accc48faa1f 100644
--- a/content/public/browser/browser_context.h
+++ b/content/public/browser/browser_context.h
@@ -52,7 +52,17 @@ class CONTENT_EXPORT BrowserContext : public base::SupportsUserData {
       const StoragePartitionCallback& callback);
   static void AsyncObliterateStoragePartition(
       BrowserContext* browser_context,
-      const GURL& site);
+      const GURL& site,
+      const base::Closure& on_gc_required);
+
+  // This function clears the contents of |active_paths| but does not take
+  // ownership of the pointer.
+  //
+  // TODO(ajwong): Don't hide the malloc via this API.
+  static void GarbageCollectStoragePartitions(
+      BrowserContext* browser_context,
+      base::hash_set<FilePath>* active_paths,
+      const base::Closure& done);
 
   // DON'T USE THIS. GetDefaultStoragePartition() is going away.
   // Use GetStoragePartition() instead. Ask ajwong@ if you have problems.