Revert 243802 "PPAPI: Add new PPB_FileRef.MakeDirectory to suppo..."

This breaks examples of NaCl SDK.
http://build.chromium.org/p/client.nacl.sdk/builders/mac-sdk-multi/builds/6796

> PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation
> 
> Current PPB_FileRef.MakeDirectory returns PP_OK if a directory exists on
> the given path. This makes it difficult to create POSIX compatible API on
> top of PPAPI.
> 
> This change introduces new PPB_FileRef.MakeDirectory as dev channel API.
> That makes a new directory according to the given PP_MakeDirectoryFlags
> values. The flags provide exclusive operation option. If exclusive flag
> is specified and a directory exists on the given path, the function fails
> and returns PP_ERROR_FILEEXISTS.
> 
> 
> BUG=314879
> TEST=browser_tests
> 
> Review URL: https://codereview.chromium.org/113363004

TBR=nhiroki@chromium.org

Review URL: https://codereview.chromium.org/131473002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243842 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243842