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..4eda5423c714c6e36b684230ea2b31e53b0d057a 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();
@@ -301,15 +292,16 @@ 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 = real_to_path.AsAbsolute();
+    if (real_to_path.empty())
       return false;
   } else {
-    real_to_path = real_to_path.DirName();
-    if (!AbsolutePath(&real_to_path))
+    real_to_path = real_to_path.DirName().AsAbsolute();
+    if (real_to_path.empty())
       return false;
   }
-  FilePath real_from_path = from_path;
-  if (!AbsolutePath(&real_from_path))
+  FilePath real_from_path = from_path.AsAbsolute();
+  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(),