Refactor Pickle Read methods to use higher performance PickleIterator.

base/file_path.cc

Index: base/file_path.cc
diff --git a/base/file_path.cc b/base/file_path.cc
index c4f1c540948abd3281e188f86de6dc49edd98231..3b1fca4b4ed6c7e8c0e52bf643211d66204a3c97 100644
--- a/base/file_path.cc
+++ b/base/file_path.cc
@@ -586,12 +586,12 @@ void FilePath::WriteToPickle(Pickle* pickle) {
 #endif
 }
 
-bool FilePath::ReadFromPickle(Pickle* pickle, void** iter) {
+bool FilePath::ReadFromPickle(PickleIterator* iter) {
 #if defined(OS_WIN)
-  if (!pickle->ReadString16(iter, &path_))
+  if (!iter->ReadString16(&path_))
     return false;
 #else
-  if (!pickle->ReadString(iter, &path_))
+  if (!iter->ReadString(&path_))
     return false;
 #endif