Remove obsolete instruction HOuterContext.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index c12e9b80833ae1d792d90679136a8de8230bdeb8..ad790b72ff539d8f933af208caadc0f80778fc12 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -1042,12 +1042,6 @@ LInstruction* LChunkBuilder::DoContext(HContext* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
-  LOperand* context = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LOuterContext(context));
-}
-
-
 LInstruction* LChunkBuilder::DoDeclareGlobals(HDeclareGlobals* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
   return MarkAsCall(new(zone()) LDeclareGlobals(context), instr);