Move path functions from file_util to FilePath object.

base/file_util_posix.cc

Index: base/file_util_posix.cc
diff --git a/base/file_util_posix.cc b/base/file_util_posix.cc
index c7014b637718ce7333c4bebd3b63192fed4a5dea..1cbf623fe4ee85fb284402577bb5f8c3aee20e5f 100644
--- a/base/file_util_posix.cc
+++ b/base/file_util_posix.cc
@@ -150,15 +150,6 @@ static std::string TempFileName() {
 #endif
 }
 
-bool AbsolutePath(FilePath* path) {
-  base::ThreadRestrictions::AssertIOAllowed();  // For realpath().
-  char full_path[PATH_MAX];
-  if (realpath(path->value().c_str(), full_path) == NULL)
-    return false;
-  *path = FilePath(full_path);
-  return true;
-}
-
 int CountFilesCreatedAfter(const FilePath& path,
                            const base::Time& comparison_time) {
   base::ThreadRestrictions::AssertIOAllowed();