Kiss goodbye to MaybeObject.

src/v8globals.h

Index: src/v8globals.h
diff --git a/src/v8globals.h b/src/v8globals.h
index c7228c04b1a51ecd9e0d26671d50648479418317..4c9da409e1663c5c54957235f7454c14ff0d0ddf 100644
--- a/src/v8globals.h
+++ b/src/v8globals.h
@@ -36,6 +36,7 @@ const intptr_t kCodeAlignment = 1 << kCodeAlignmentBits;
 const intptr_t kCodeAlignmentMask = kCodeAlignment - 1;
 
 // Tag information for Failure.
+// TODO(yangguo): remove this from space owner calculation.
 const int kFailureTag = 3;
 const int kFailureTagSize = 2;
 const intptr_t kFailureTagMask = (1 << kFailureTagSize) - 1;
@@ -124,7 +125,6 @@ class MapSpace;
 class MarkCompactCollector;
 class NewSpace;
 class Object;
-class MaybeObject;
 class OldSpace;
 class Foreign;
 class Scope;
@@ -162,6 +162,7 @@ enum AllocationSpace {
   CELL_SPACE,           // Only and all cell objects.
   PROPERTY_CELL_SPACE,  // Only and all global property cell objects.
   LO_SPACE,             // Promoted large objects.
+  INVALID_SPACE,        // Only used in AllocationResult to signal success.
 
   FIRST_SPACE = NEW_SPACE,
   LAST_SPACE = LO_SPACE,