Convert //chrome/browser/chromeos from scoped_ptr to std::unique_ptr

chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h

Index: chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h
diff --git a/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h b/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h
index 71089ba6a9775146bf4278e6e54cc1d4620e91af..6ac4027e6a168b1119176c81f936ed6cb0193be4 100644
--- a/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h
+++ b/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h
@@ -7,8 +7,9 @@
 
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/fileapi/file_system_backend_delegate.h"
 
 namespace storage {
@@ -32,13 +33,13 @@ class FileSystemBackendDelegate : public chromeos::FileSystemBackendDelegate {
   // FileSystemBackend::Delegate overrides.
   storage::AsyncFileUtil* GetAsyncFileUtil(
       storage::FileSystemType type) override;
-  scoped_ptr<storage::FileStreamReader> CreateFileStreamReader(
+  std::unique_ptr<storage::FileStreamReader> CreateFileStreamReader(
       const storage::FileSystemURL& url,
       int64_t offset,
       int64_t max_bytes_to_read,
       const base::Time& expected_modification_time,
       storage::FileSystemContext* context) override;
-  scoped_ptr<storage::FileStreamWriter> CreateFileStreamWriter(
+  std::unique_ptr<storage::FileStreamWriter> CreateFileStreamWriter(
       const storage::FileSystemURL& url,
       int64_t offset,
       storage::FileSystemContext* context) override;
@@ -48,7 +49,7 @@ class FileSystemBackendDelegate : public chromeos::FileSystemBackendDelegate {
                                  const storage::URLCallback& callback) override;
 
  private:
-  scoped_ptr<storage::AsyncFileUtil> async_file_util_;
+  std::unique_ptr<storage::AsyncFileUtil> async_file_util_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemBackendDelegate);
 };