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

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

Index: chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.cc
diff --git a/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.cc b/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.cc
index 22fb9bc601511a874c762fcde90eaf1a5c4854a6..d4c4483cc3828fa926292bafdda46e77baf88493 100644
--- a/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.cc
+++ b/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.cc
@@ -4,9 +4,10 @@
 
 #include "chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h"
 
+#include <memory>
+
 #include "base/bind.h"
 #include "base/files/file_path.h"
-#include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/drive/fileapi/async_file_util.h"
 #include "chrome/browser/chromeos/drive/fileapi/fileapi_worker.h"
@@ -30,7 +31,7 @@ namespace {
 void GetRedirectURLForContentsOnUIThreadWithResourceEntry(
     const storage::URLCallback& callback,
     FileError error,
-    scoped_ptr<ResourceEntry> entry) {
+    std::unique_ptr<ResourceEntry> entry) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   GURL url;
   if (error == FILE_ERROR_OK && entry->has_file_specific_info() &&
@@ -84,7 +85,7 @@ storage::AsyncFileUtil* FileSystemBackendDelegate::GetAsyncFileUtil(
   return async_file_util_.get();
 }
 
-scoped_ptr<storage::FileStreamReader>
+std::unique_ptr<storage::FileStreamReader>
 FileSystemBackendDelegate::CreateFileStreamReader(
     const storage::FileSystemURL& url,
     int64_t offset,
@@ -96,18 +97,16 @@ FileSystemBackendDelegate::CreateFileStreamReader(
 
   base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
   if (file_path.empty())
-    return scoped_ptr<storage::FileStreamReader>();
+    return std::unique_ptr<storage::FileStreamReader>();
 
-  return scoped_ptr<storage::FileStreamReader>(
+  return std::unique_ptr<storage::FileStreamReader>(
       new internal::WebkitFileStreamReaderImpl(
           base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
-          context->default_file_task_runner(),
-          file_path,
-          offset,
+          context->default_file_task_runner(), file_path, offset,
           expected_modification_time));
 }
 
-scoped_ptr<storage::FileStreamWriter>
+std::unique_ptr<storage::FileStreamWriter>
 FileSystemBackendDelegate::CreateFileStreamWriter(
     const storage::FileSystemURL& url,
     int64_t offset,
@@ -118,14 +117,12 @@ FileSystemBackendDelegate::CreateFileStreamWriter(
   base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
   // Hosted documents don't support stream writer.
   if (file_path.empty() || util::HasHostedDocumentExtension(file_path))
-    return scoped_ptr<storage::FileStreamWriter>();
+    return std::unique_ptr<storage::FileStreamWriter>();
 
-  return scoped_ptr<storage::FileStreamWriter>(
+  return std::unique_ptr<storage::FileStreamWriter>(
       new internal::WebkitFileStreamWriterImpl(
           base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
-          context->default_file_task_runner(),
-          file_path,
-          offset));
+          context->default_file_task_runner(), file_path, offset));
 }
 
 storage::WatcherManager* FileSystemBackendDelegate::GetWatcherManager(