Revert r5174.

src/heap.h

Index: src/heap.h
===================================================================
--- src/heap.h	(revision 5176)
+++ src/heap.h	(working copy)
@@ -877,8 +877,6 @@
 #ifdef DEBUG
   static bool IsAllocationAllowed() { return allocation_allowed_; }
   static inline bool allow_allocation(bool enable);
-  static bool IsGCAllowed() { return gc_allowed_; }
-  static inline bool allow_gc(bool enable);
 
   static bool disallow_allocation_failure() {
     return disallow_allocation_failure_;
@@ -1080,7 +1078,6 @@
 
 #ifdef DEBUG
   static bool allocation_allowed_;
-  static bool gc_allowed_;
 
   // If the --gc-interval flag is set to a positive value, this
   // variable holds the value indicating the number of allocations
@@ -1683,20 +1680,6 @@
   bool old_state_;
 };
 
-class AssertNoGC {
- public:
-  AssertNoGC() {
-    old_state_ = Heap::allow_gc(false);
-  }
-
-  ~AssertNoGC() {
-    Heap::allow_gc(old_state_);
-  }
-
- private:
-  bool old_state_;
-};
-
 class DisableAssertNoAllocation {
  public:
   DisableAssertNoAllocation() {
@@ -1719,12 +1702,6 @@
   ~AssertNoAllocation() { }
 };
 
-class AssertNoGC {
- public:
-  AssertNoGC() { }
-  ~AssertNoGC() { }
-};
-
 class DisableAssertNoAllocation {
  public:
   DisableAssertNoAllocation() { }