Add FilePath to base namespace.

chrome/browser/chromeos/drive/file_system/remove_operation.h

Index: chrome/browser/chromeos/drive/file_system/remove_operation.h
diff --git a/chrome/browser/chromeos/drive/file_system/remove_operation.h b/chrome/browser/chromeos/drive/file_system/remove_operation.h
index f856eeb0c214856df55e1c44e598622448950d93..df0c0d79a8ed5933eb0c31813a526078e0c61ae9 100644
--- a/chrome/browser/chromeos/drive/file_system/remove_operation.h
+++ b/chrome/browser/chromeos/drive/file_system/remove_operation.h
@@ -11,9 +11,12 @@
 #include "chrome/browser/chromeos/drive/drive_resource_metadata.h"
 #include "chrome/browser/google_apis/gdata_errorcode.h"
 
-class FilePath;
 class GURL;
 
+namespace base {
+class FilePath;
+}
+
 namespace google_apis {
 }
 
@@ -42,7 +45,7 @@ class RemoveOperation {
   // Perform the remove operation on the file at drive path |file_path|.
   // Invokes |callback| when finished with the result of the operation.
   // |callback| must not be null.
-  virtual void Remove(const FilePath& file_path,
+  virtual void Remove(const base::FilePath& file_path,
                       bool is_recursive,
                       const FileOperationCallback& callback);
 
@@ -67,7 +70,7 @@ class RemoveOperation {
   void NotifyDirectoryChanged(
       const FileOperationCallback& callback,
       DriveFileError error,
-      const FilePath& directory_path);
+      const base::FilePath& directory_path);
 
   DriveScheduler* drive_scheduler_;
   DriveCache* cache_;