Make base compile with no "using base::FilePath".

For base .cc files not using the base namespace, I added a using since theses
files should be moved to the base namespace, and then explicit qualification
will no longer be necessary.

Original review URL: https://codereview.chromium.org/12226121
(reland of r182040).
Review URL: https://codereview.chromium.org/12278014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182916 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 04af979a6940c84bc315b3bf6c946824f0262614
diff --git a/base/file_util_linux.cc b/base/file_util_linux.cc
index f7d4f6e..cee2526 100644
--- a/base/file_util_linux.cc
+++ b/base/file_util_linux.cc
@@ -11,7 +11,7 @@
 
 namespace file_util {
 
-bool GetFileSystemType(const FilePath& path, FileSystemType* type) {
+bool GetFileSystemType(const base::FilePath& path, FileSystemType* type) {
   struct statfs statfs_buf;
   if (statfs(path.value().c_str(), &statfs_buf) < 0) {
     if (errno == ENOENT)