Revert memory saving change due to failures on multithreaded tests

test/cctest/test-spaces.cc

Index: test/cctest/test-spaces.cc
===================================================================
--- test/cctest/test-spaces.cc	(revision 10568)
+++ test/cctest/test-spaces.cc	(working copy)
@@ -140,8 +140,8 @@
                        heap->MaxReserved(),
                        OLD_POINTER_SPACE,
                        NOT_EXECUTABLE);
-  Page* first_page = memory_allocator->AllocatePage(
-      Page::kObjectAreaSize, &faked_space, NOT_EXECUTABLE);
+  Page* first_page =
+      memory_allocator->AllocatePage(&faked_space, NOT_EXECUTABLE);
 
   first_page->InsertAfter(faked_space.anchor()->prev_page());
   CHECK(first_page->is_valid());
@@ -154,8 +154,7 @@
 
   // Again, we should get n or n - 1 pages.
   Page* other =
-      memory_allocator->AllocatePage(
-          Page::kObjectAreaSize, &faked_space, NOT_EXECUTABLE);
+      memory_allocator->AllocatePage(&faked_space, NOT_EXECUTABLE);
   CHECK(other->is_valid());
   total_pages++;
   other->InsertAfter(first_page);