Refactor FileSystemOperation to take callback for each method.

chrome/browser/extensions/extension_file_browser_private_api.cc

Index: chrome/browser/extensions/extension_file_browser_private_api.cc
diff --git a/chrome/browser/extensions/extension_file_browser_private_api.cc b/chrome/browser/extensions/extension_file_browser_private_api.cc
index da6453e2719d57c861fa06f0b4acd8c489c1b56f..ff2079ae44743e5404f295088ddd925e8f2fd4e1 100644
--- a/chrome/browser/extensions/extension_file_browser_private_api.cc
+++ b/chrome/browser/extensions/extension_file_browser_private_api.cc
@@ -314,41 +314,26 @@ base::DictionaryValue* MountPointToValue(Profile* profile,
 
 }  // namespace
 
-class RequestLocalFileSystemFunction::LocalFileSystemCallbackDispatcher
-    : public fileapi::FileSystemCallbackDispatcher {
+class RequestLocalFileSystemFunction::LocalFileSystemCallbackDispatcher {
  public:
-  static scoped_ptr<FileSystemCallbackDispatcher> Create(
+  static fileapi::FileSystemContext::OpenFileSystemCallback CreateCallback(
       RequestLocalFileSystemFunction* function,
       Profile* profile,
       int child_id,
       scoped_refptr<const Extension> extension) {
-    return scoped_ptr<fileapi::FileSystemCallbackDispatcher>(
-        new LocalFileSystemCallbackDispatcher(
-            function, profile, child_id, extension));
+    return base::Bind(
+        &LocalFileSystemCallbackDispatcher::DidOpenFileSystem,
+        base::Owned(new LocalFileSystemCallbackDispatcher(
+            function, profile, child_id, extension)));
   }
 
-  // fileapi::FileSystemCallbackDispatcher overrides.
-  virtual void DidSucceed() OVERRIDE {
-    NOTREACHED();
-  }
-
-  virtual void DidReadMetadata(const base::PlatformFileInfo& info,
-                               const FilePath& unused) OVERRIDE {
-    NOTREACHED();
-  }
-
-  virtual void DidReadDirectory(
-      const std::vector<base::FileUtilProxy::Entry>& entries,
-      bool has_more) OVERRIDE {
-    NOTREACHED();
-  }
-
-  virtual void DidWrite(int64 bytes, bool complete) OVERRIDE {
-    NOTREACHED();
-  }
-
-  virtual void DidOpenFileSystem(const std::string& name,
-                                 const GURL& root_path) OVERRIDE {
+  void DidOpenFileSystem(base::PlatformFileError result,
+                         const std::string& name,
+                         const GURL& root_path) {
+    if (result != base::PLATFORM_FILE_OK) {
+      DidFail(result);
+      return;
+    }
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
     // Set up file permission access.
     if (!SetupFileSystemAccessPermissions()) {
@@ -365,7 +350,7 @@ class RequestLocalFileSystemFunction::LocalFileSystemCallbackDispatcher
             root_path));
   }
 
-  virtual void DidFail(base::PlatformFileError error_code) OVERRIDE {
+  void DidFail(base::PlatformFileError error_code) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(
@@ -434,7 +419,7 @@ void RequestLocalFileSystemFunction::RequestOnFileThread(
   GURL origin_url = source_url.GetOrigin();
   profile()->GetFileSystemContext()->OpenFileSystem(
       origin_url, fileapi::kFileSystemTypeExternal, false, // create
-      LocalFileSystemCallbackDispatcher::Create(
+      LocalFileSystemCallbackDispatcher::CreateCallback(
           this,
           profile(),
           child_id,
@@ -628,10 +613,10 @@ bool GetFileTasksFileBrowserFunction::RunImpl() {
   return true;
 }
 
-class ExecuteTasksFileBrowserFunction::ExecuteTasksFileSystemCallbackDispatcher
-    : public fileapi::FileSystemCallbackDispatcher {
+class
+  ExecuteTasksFileBrowserFunction::ExecuteTasksFileSystemCallbackDispatcher {
  public:
-  static scoped_ptr<fileapi::FileSystemCallbackDispatcher> Create(
+  static fileapi::FileSystemContext::OpenFileSystemCallback CreateCallback(
       ExecuteTasksFileBrowserFunction* function,
       Profile* profile,
       int child_id,
@@ -639,34 +624,20 @@ class ExecuteTasksFileBrowserFunction::ExecuteTasksFileSystemCallbackDispatcher
       scoped_refptr<const Extension> extension,
       const std::string task_id,
       const std::vector<GURL>& file_urls) {
-    return scoped_ptr<fileapi::FileSystemCallbackDispatcher>(
-        new ExecuteTasksFileSystemCallbackDispatcher(
+    return base::Bind(
+        &ExecuteTasksFileSystemCallbackDispatcher::DidOpenFileSystem,
+        base::Owned(new ExecuteTasksFileSystemCallbackDispatcher(
             function, profile, child_id, source_url, extension,
-            task_id, file_urls));
+            task_id, file_urls)));
   }
 
-  // fileapi::FileSystemCallbackDispatcher overrides.
-  virtual void DidSucceed() OVERRIDE {
-    NOTREACHED();
-  }
-
-  virtual void DidReadMetadata(const base::PlatformFileInfo& info,
-                               const FilePath& unused) OVERRIDE {
-    NOTREACHED();
-  }
-
-  virtual void DidReadDirectory(
-      const std::vector<base::FileUtilProxy::Entry>& entries,
-      bool has_more) OVERRIDE {
-    NOTREACHED();
-  }
-
-  virtual void DidWrite(int64 bytes, bool complete) OVERRIDE {
-    NOTREACHED();
-  }
-
-  virtual void DidOpenFileSystem(const std::string& file_system_name,
-                                 const GURL& file_system_root) OVERRIDE {
+  void DidOpenFileSystem(base::PlatformFileError result,
+                         const std::string& file_system_name,
+                         const GURL& file_system_root) {
+    if (result != base::PLATFORM_FILE_OK) {
+      DidFail(result);
+      return;
+    }
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
     ExecuteTasksFileBrowserFunction::FileDefinitionList file_list;
     for (std::vector<GURL>::iterator iter = origin_file_urls_.begin();
@@ -700,7 +671,7 @@ class ExecuteTasksFileBrowserFunction::ExecuteTasksFileSystemCallbackDispatcher
             file_list));
   }
 
-  virtual void DidFail(base::PlatformFileError error_code) OVERRIDE {
+  void DidFail(base::PlatformFileError error_code) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(
@@ -899,7 +870,7 @@ void ExecuteTasksFileBrowserFunction::RequestFileEntryOnFileThread(
   GURL origin_url = source_url.GetOrigin();
   profile()->GetFileSystemContext()->OpenFileSystem(
       origin_url, fileapi::kFileSystemTypeExternal, false, // create
-      ExecuteTasksFileSystemCallbackDispatcher::Create(
+      ExecuteTasksFileSystemCallbackDispatcher::CreateCallback(
           this,
           profile(),
           render_view_host()->process()->GetID(),