Allow temporary file system for incognito DevTools.

storage/browser/fileapi/file_system_context.h

Index: storage/browser/fileapi/file_system_context.h
diff --git a/storage/browser/fileapi/file_system_context.h b/storage/browser/fileapi/file_system_context.h
index d5d4e865802f91f4623e3c5b1080a9b982d9e3c9..7979407310c607a59c6c3cacce2d5f7e1e43e1d4 100644
--- a/storage/browser/fileapi/file_system_context.h
+++ b/storage/browser/fileapi/file_system_context.h
@@ -289,10 +289,7 @@ class STORAGE_EXPORT FileSystemContext
                                            FileSystemType type,
                                            const base::FilePath& path) const;
 
-#if defined(OS_CHROMEOS)
-  // Used only on ChromeOS for now.

[nhiroki, 2016/12/09 07:52:59]

Could you add a comment like this?:

// Used only on ChromeOS or for DevTools on other platforms.
// (https://crbug.com/93417)

   void EnableTemporaryFileSystemInIncognito();
-#endif
 
   SandboxFileSystemBackendDelegate* sandbox_delegate() {
     return sandbox_delegate_.get();