Make Failure inherit from MaybeObject instead of Object.

test/cctest/test-serialize.cc

Index: test/cctest/test-serialize.cc
===================================================================
--- test/cctest/test-serialize.cc	(revision 5696)
+++ test/cctest/test-serialize.cc	(working copy)
@@ -576,7 +576,8 @@
     for (int i = 0;
          i + kSmallFixedArraySize <= new_space_size;
          i += kSmallFixedArraySize) {
-      Object* obj = Heap::AllocateFixedArray(kSmallFixedArrayLength);
+      Object* obj =
+          Heap::AllocateFixedArray(kSmallFixedArrayLength)->ToObjectChecked();
       if (new_last != NULL) {
         CHECK(reinterpret_cast<char*>(obj) ==
               reinterpret_cast<char*>(new_last) + kSmallFixedArraySize);
@@ -588,7 +589,8 @@
     for (int i = 0;
          i + kSmallFixedArraySize <= size;
          i += kSmallFixedArraySize) {
-      Object* obj = Heap::AllocateFixedArray(kSmallFixedArrayLength, TENURED);
+      Object* obj = Heap::AllocateFixedArray(kSmallFixedArrayLength,
+                                             TENURED)->ToObjectChecked();
       int old_page_fullness = i % Page::kPageSize;
       int page_fullness = (i + kSmallFixedArraySize) % Page::kPageSize;
       if (page_fullness < old_page_fullness ||
@@ -605,7 +607,8 @@
 
     Object* data_last = NULL;
     for (int i = 0; i + kSmallStringSize <= size; i += kSmallStringSize) {
-      Object* obj = Heap::AllocateRawAsciiString(kSmallStringLength, TENURED);
+      Object* obj = Heap::AllocateRawAsciiString(kSmallStringLength,
+                                                 TENURED)->ToObjectChecked();
       int old_page_fullness = i % Page::kPageSize;
       int page_fullness = (i + kSmallStringSize) % Page::kPageSize;
       if (page_fullness < old_page_fullness ||
@@ -622,7 +625,8 @@
 
     Object* map_last = NULL;
     for (int i = 0; i + kMapSize <= size; i += kMapSize) {
-      Object* obj = Heap::AllocateMap(JS_OBJECT_TYPE, 42 * kPointerSize);
+      Object* obj = Heap::AllocateMap(JS_OBJECT_TYPE,
+                                      42 * kPointerSize)->ToObjectChecked();
       int old_page_fullness = i % Page::kPageSize;
       int page_fullness = (i + kMapSize) % Page::kPageSize;
       if (page_fullness < old_page_fullness ||
@@ -644,7 +648,7 @@
       int large_object_array_length =
           (size - FixedArray::kHeaderSize) / kPointerSize;
       Object* obj = Heap::AllocateFixedArray(large_object_array_length,
-                                             TENURED);
+                                             TENURED)->ToObjectChecked();
       CHECK(!obj->IsFailure());
     }
   }