libchrome: Several upstreamable fixes from libchrome

base/pickle.cc

Index: base/pickle.cc
diff --git a/base/pickle.cc b/base/pickle.cc
index cfb316c13e56974abc7ffb98fa7e4693e40a7301..1e57a650013413c8543cfc4fbbb74f294e8c1e70 100644
--- a/base/pickle.cc
+++ b/base/pickle.cc
@@ -364,12 +364,12 @@ void Pickle::Reserve(size_t length) {
     Resize(capacity_after_header_ * 2 + new_size);
 }
 
-bool Pickle::WriteAttachment(scoped_refptr<Attachment> attachment) {
+bool Pickle::WriteAttachment(scoped_refptr<Attachment> /* attachment */) {
   return false;
 }
 
-bool Pickle::ReadAttachment(base::PickleIterator* iter,
-                            scoped_refptr<Attachment>* attachment) const {
+bool Pickle::ReadAttachment(base::PickleIterator* /* iter */,
+                            scoped_refptr<Attachment>* /* attachment */) const {
   return false;
 }