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

Review URL: https://codereview.chromium.org/242113007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@264800 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed