Revert of GC plugin: improve error reporting when tracing illegal fields.

tools/clang/blink_gc_plugin/tests/heap/stubs.h

Index: tools/clang/blink_gc_plugin/tests/heap/stubs.h
diff --git a/tools/clang/blink_gc_plugin/tests/heap/stubs.h b/tools/clang/blink_gc_plugin/tests/heap/stubs.h
index 3b8c719894ce96fb1246e681f99eaf79661e5732..8f7feccc9c49c61dec056168f4bae3933a03a4ce 100644
--- a/tools/clang/blink_gc_plugin/tests/heap/stubs.h
+++ b/tools/clang/blink_gc_plugin/tests/heap/stubs.h
@@ -118,17 +118,6 @@
 
 }
 
-namespace std {
-
-template<typename T> class unique_ptr {
-public:
-    ~unique_ptr() { }
-    operator T*() const { return 0; }
-    T* operator->() { return 0; }
-};
-
-}
-
 namespace blink {
 
 using namespace WTF;
@@ -189,27 +178,6 @@
     bool operator!() const { return false; }
 };
 
-template<typename T> class WeakPersistent {
-public:
-    operator T*() const { return 0; }
-    T* operator->() { return 0; }
-    bool operator!() const { return false; }
-};
-
-template<typename T> class CrossThreadPersistent {
-public:
-    operator T*() const { return 0; }
-    T* operator->() { return 0; }
-    bool operator!() const { return false; }
-};
-
-template<typename T> class CrossThreadWeakPersistent {
-public:
-    operator T*() const { return 0; }
-    T* operator->() { return 0; }
-    bool operator!() const { return false; }
-};
-
 class HeapAllocator {
 public:
     static const bool isGarbageCollected = true;