[fsp] Refactor handling operations.

chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h

Index: chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h b/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h
index 3a552d84ca4a94efcf3c49d6e432433a9ba58a5b..2af2430c7a1874a2a0e4ee50be84d4d811f02f43 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h
@@ -9,6 +9,10 @@
 
 class EventRouter;
 
+namespace base {
+class FilePath;
+}  // namespace base
+
 namespace chromeos {
 namespace file_system_provider {
 
@@ -23,9 +27,8 @@ class ProvidedFileSystemInterface {
   virtual ~ProvidedFileSystemInterface() {}
 
   // Requests unmounting of the file system. The callback is called when the
-  // request is accepted or rejected, with an error code. Returns false if the
-  // request could not been created, true otherwise.
-  virtual bool RequestUnmount(
+  // request is accepted or rejected, with an error code.
+  virtual void RequestUnmount(
       const fileapi::AsyncFileUtil::StatusCallback& callback) = 0;
 
   // Returns a provided file system info for this file system.