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 8bf164ace5c4a175907d416672e0507362808e6c..8b368127410e091eb392cf440f2bd9c50a417acd 100644
--- a/base/file_util_posix.cc
+++ b/base/file_util_posix.cc
@@ -59,6 +59,19 @@
 #endif
 
 using base::FilePath;
+using base::MakeAbsoluteFilePath;
+
+namespace base {
+
+FilePath MakeAbsoluteFilePath(const FilePath& input) {
+  base::ThreadRestrictions::AssertIOAllowed();
+  char full_path[PATH_MAX];
+  if (realpath(input.value().c_str(), full_path) == NULL)
+    return FilePath();
+  return FilePath(full_path);
+}
+
+}  // namespace base
 
 namespace file_util {
 
@@ -150,15 +163,6 @@ 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;
-}
-
 // TODO(erikkay): The Windows version of this accepts paths like "foo/bar/*"
 // which works both with and without the recursive flag.  I'm not sure we need
 // that functionality. If not, remove from file_util_win.cc, otherwise add it
@@ -253,15 +257,16 @@ bool CopyDirectory(const FilePath& from_path,
   // This function does not properly handle destinations within the source
   FilePath real_to_path = to_path;
   if (PathExists(real_to_path)) {
-    if (!AbsolutePath(&real_to_path))
+    real_to_path = MakeAbsoluteFilePath(real_to_path);
+    if (real_to_path.empty())
       return false;
   } else {
-    real_to_path = real_to_path.DirName();
-    if (!AbsolutePath(&real_to_path))
+    real_to_path = MakeAbsoluteFilePath(real_to_path.DirName());
+    if (real_to_path.empty())
       return false;
   }
-  FilePath real_from_path = from_path;
-  if (!AbsolutePath(&real_from_path))
+  FilePath real_from_path = MakeAbsoluteFilePath(from_path);
+  if (real_from_path.empty())
     return false;
   if (real_to_path.value().size() >= real_from_path.value().size() &&
       real_to_path.value().compare(0, real_from_path.value().size(),