Revert 264780 "[fsp] Add FileSystemURLParser to the file system ..."

Revert 264780 "[fsp] Add FileSystemURLParser to the file system ..."

Dependent on 264778 which broke Linux ChromeOS ASan.

> [fsp] Add FileSystemURLParser to the file system provider.
> 
> The FileSystemURLParser is a class which parses a cracked FileSystemURL to
> associate it with the proper ProvidedFileSystem class handling this URL.
> 
> This will be necessary to route operations from AsyncFileUtil to a proper
> providing extension.
> 
> Along the way, the Service class has been fixed. Now, the provided file systems
> are gracefully unmounted in destructor. As a result, the external mount points
> are cleared neatly.
> 
> TEST=unit_tests: FileSystemProviderMountPathUtilTest*
> BUG=248427
> 
> Review URL: https://codereview.chromium.org/237583015

TBR=mtomasz@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=264800

[Ken Rockot(use gerrit already), 2014-04-18 15:59:55]

Committed patchset #1 manually as r264800.