MIPS: Remove keyed_store_calling convention and friends.

src/mips/ic-mips.cc

Index: src/mips/ic-mips.cc
diff --git a/src/mips/ic-mips.cc b/src/mips/ic-mips.cc
index d5e60c452ed2f87b6b3db204550e21c5ec14aa09..4d34fc4e59d59aaa5fb6b971401a81dab0395e6c 100644
--- a/src/mips/ic-mips.cc
+++ b/src/mips/ic-mips.cc
@@ -529,21 +529,6 @@ const Register StoreIC::NameRegister() { return a2; }
 const Register StoreIC::ValueRegister() { return a0; }
 
 
-const Register KeyedStoreIC::ReceiverRegister() {
-  return StoreIC::ReceiverRegister();
-}
-
-
-const Register KeyedStoreIC::NameRegister() {
-  return StoreIC::NameRegister();
-}
-
-
-const Register KeyedStoreIC::ValueRegister() {
-  return StoreIC::ValueRegister();
-}
-
-
 const Register KeyedStoreIC::MapRegister() {
   return a3;
 }