[fsp] Create a RequestManager per a ProvidedFileSystem instance.

chrome/browser/chromeos/file_system_provider/provided_file_system.cc

Index: chrome/browser/chromeos/file_system_provider/provided_file_system.cc
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system.cc b/chrome/browser/chromeos/file_system_provider/provided_file_system.cc
index 7185c0a4c8b8c8727d46a297ba24a96ca93ec432..93a9bd25b6249c54c9988d86eb616baade190db9 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system.cc
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system.cc
@@ -37,21 +37,15 @@ void OnRequestUnmountSuccess(
 
 ProvidedFileSystem::ProvidedFileSystem(
     extensions::EventRouter* event_router,
-    RequestManager* request_manager,
     const ProvidedFileSystemInfo& file_system_info)
-    : event_router_(event_router),
-      request_manager_(request_manager),
-      file_system_info_(file_system_info) {}
+    : event_router_(event_router), file_system_info_(file_system_info) {}
 
 ProvidedFileSystem::~ProvidedFileSystem() {}
 
 bool ProvidedFileSystem::RequestUnmount(
     const fileapi::AsyncFileUtil::StatusCallback& callback) {
-  int request_id = request_manager_->CreateRequest(
-      file_system_info_.extension_id(),
-      file_system_info_.file_system_id(),
-      base::Bind(&OnRequestUnmountSuccess, callback),
-      callback);
+  int request_id = request_manager_.CreateRequest(
+      base::Bind(&OnRequestUnmountSuccess, callback), callback);
 
   if (!request_id)
     return false;
@@ -72,5 +66,9 @@ const ProvidedFileSystemInfo& ProvidedFileSystem::GetFileSystemInfo() const {
   return file_system_info_;
 }
 
+RequestManager* ProvidedFileSystem::GetRequestManager() {
+  return &request_manager_;
+}
+
 }  // namespace file_system_provider
 }  // namespace chromeos