Remove obsolete kForceCompactionMask flag for GC.

src/extensions/gc-extension.cc

Index: src/extensions/gc-extension.cc
diff --git a/src/extensions/gc-extension.cc b/src/extensions/gc-extension.cc
index dfe389a6d4d88c43bf30aca79148fb02fe8bc3e6..48e8c42057600530de93cd8b7a11714a96b57b64 100644
--- a/src/extensions/gc-extension.cc
+++ b/src/extensions/gc-extension.cc
@@ -40,12 +40,7 @@ v8::Handle<v8::FunctionTemplate> GCExtension::GetNativeFunction(
 
 
 v8::Handle<v8::Value> GCExtension::GC(const v8::Arguments& args) {
-  int flags = Heap::kNoGCFlags;
-  // All allocation spaces other than NEW_SPACE have the same effect.
-  if (args.Length() >= 1 && args[0]->IsBoolean()) {
-    if (args[0]->BooleanValue()) flags |= Heap::kForceCompactionMask;
-  }
-  HEAP->CollectAllGarbage(flags);
+  HEAP->CollectAllGarbage(Heap::kNoGCFlags);
   return v8::Undefined();
 }