Remove some uses of MaybeObject methods.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index e38c2852b4d0f28b7108676a82a5ff070d5fcb0c..046c5698058474f21b4d26499551e5a535effa9f 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -673,16 +673,6 @@ bool MaybeObject::IsException() {
 }
 
 
-bool MaybeObject::IsTheHole() {
-  return !IsFailure() && ToObjectUnchecked()->IsTheHole();
-}
-
-
-bool MaybeObject::IsUninitialized() {
-  return !IsFailure() && ToObjectUnchecked()->IsUninitialized();
-}
-
-
 Failure* Failure::cast(MaybeObject* obj) {
   ASSERT(HAS_FAILURE_TAG(obj));
   return reinterpret_cast<Failure*>(obj);
@@ -1301,11 +1291,6 @@ Failure::Type Failure::type() const {
 }
 
 
-bool Failure::IsInternalError() const {
-  return type() == INTERNAL_ERROR;
-}
-
-
 AllocationSpace Failure::allocation_space() const {
   ASSERT_EQ(RETRY_AFTER_GC, type());
   return static_cast<AllocationSpace>((value() >> kFailureTypeTagSize)