Change the API of disk_cache::CreateCacheBackend to use scoped_ptr

net/disk_cache/cache_creator.cc

Index: net/disk_cache/cache_creator.cc
diff --git a/net/disk_cache/cache_creator.cc b/net/disk_cache/cache_creator.cc
index 8384f82fd1eccc6910b6ec79c986689de90e9a9b..07a26c9d8581235f19835d121bc4e6bc39be8cd8 100644
--- a/net/disk_cache/cache_creator.cc
+++ b/net/disk_cache/cache_creator.cc
@@ -9,6 +9,7 @@
 #include "net/base/net_errors.h"
 #include "net/disk_cache/backend_impl.h"
 #include "net/disk_cache/cache_util.h"
+#include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/mem_backend_impl.h"
 #include "net/disk_cache/simple/simple_backend_impl.h"
 
@@ -26,7 +27,7 @@ class CacheCreator {
   CacheCreator(const base::FilePath& path, bool force, int max_bytes,
                net::CacheType type, net::BackendType backend_type, uint32 flags,
                base::MessageLoopProxy* thread, net::NetLog* net_log,
-               disk_cache::Backend** backend,
+               scoped_ptr<disk_cache::Backend>* backend,
                const net::CompletionCallback& callback);
 
   // Creates the backend.
@@ -47,9 +48,9 @@ class CacheCreator {
   net::BackendType backend_type_;
   uint32 flags_;
   scoped_refptr<base::MessageLoopProxy> thread_;
-  disk_cache::Backend** backend_;
+  scoped_ptr<disk_cache::Backend>* backend_;
   net::CompletionCallback callback_;
-  disk_cache::Backend* created_cache_;
+  scoped_ptr<disk_cache::Backend> created_cache_;
   net::NetLog* net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(CacheCreator);
@@ -59,7 +60,7 @@ CacheCreator::CacheCreator(
     const base::FilePath& path, bool force, int max_bytes,
     net::CacheType type, net::BackendType backend_type, uint32 flags,
     base::MessageLoopProxy* thread, net::NetLog* net_log,
-    disk_cache::Backend** backend,
+    scoped_ptr<disk_cache::Backend>* backend,
     const net::CompletionCallback& callback)
     : path_(path),
       force_(force),
@@ -71,7 +72,6 @@ CacheCreator::CacheCreator(
       thread_(thread),
       backend_(backend),
       callback_(callback),
-      created_cache_(NULL),
       net_log_(net_log) {
 }
 
@@ -86,13 +86,13 @@ int CacheCreator::Run() {
     disk_cache::SimpleBackendImpl* simple_cache =
         new disk_cache::SimpleBackendImpl(path_, max_bytes_, type_,
                                           thread_.get(), net_log_);
-    created_cache_ = simple_cache;
+    created_cache_.reset(simple_cache);
     return simple_cache->Init(
         base::Bind(&CacheCreator::OnIOComplete, base::Unretained(this)));
   }
   disk_cache::BackendImpl* new_cache =
       new disk_cache::BackendImpl(path_, thread_.get(), net_log_);
-  created_cache_ = new_cache;
+  created_cache_.reset(new_cache);
   new_cache->SetMaxSize(max_bytes_);
   new_cache->SetType(type_);
   new_cache->SetFlags(flags_);
@@ -106,14 +106,13 @@ void CacheCreator::DoCallback(int result) {
   DCHECK_NE(net::ERR_IO_PENDING, result);
   if (result == net::OK) {
 #ifndef USE_TRACING_CACHE_BACKEND
-    *backend_ = created_cache_;
+    *backend_ = created_cache_.Pass();
 #else
-    *backend_ = new disk_cache::TracingCacheBackend(created_cache_);
+    *backend_.reset(
+        new disk_cache::TracingCacheBackend(created_cache_.Pass()));
 #endif
   } else {
     LOG(ERROR) << "Unable to create cache";
-    *backend_ = NULL;
-    delete created_cache_;
   }
   callback_.Run(result);
   delete this;
@@ -128,8 +127,7 @@ void CacheCreator::OnIOComplete(int result) {
   // This is a failure and we are supposed to try again, so delete the object,
   // delete all the files, and try again.
   retry_ = true;
-  delete created_cache_;
-  created_cache_ = NULL;
+  created_cache_.reset();
   if (!disk_cache::DelayedCacheCleanup(path_))
     return DoCallback(result);
 
@@ -148,7 +146,7 @@ int CreateCacheBackend(net::CacheType type,
                        const base::FilePath& path,
                        int max_bytes,
                        bool force, base::MessageLoopProxy* thread,
-                       net::NetLog* net_log, Backend** backend,
+                       net::NetLog* net_log, scoped_ptr<Backend>* backend,
                        const net::CompletionCallback& callback) {
   DCHECK(!callback.is_null());
   if (type == net::MEMORY_CACHE) {