[wasm] Dont ship by default.

src/wasm/wasm-js.cc

Index: src/wasm/wasm-js.cc
diff --git a/src/wasm/wasm-js.cc b/src/wasm/wasm-js.cc
index 21b32e7eb6499dc2e40943719b1b23cc5dfbef2c..d85e3da412f9d559de8e277cb6864d5da1b3771f 100644
--- a/src/wasm/wasm-js.cc
+++ b/src/wasm/wasm-js.cc
@@ -415,12 +415,20 @@ static Handle<JSFunction> InstallFunc(Isolate* isolate, Handle<JSObject> object,
 }
 
 void WasmJs::Install(Isolate* isolate, Handle<JSGlobalObject> global) {
+  if (!FLAG_expose_wasm && !FLAG_validate_asm) {
+    return;
+  }
+
   Factory* factory = isolate->factory();
 
   // Setup wasm function map.
   Handle<Context> context(global->native_context(), isolate);
   InstallWasmFunctionMap(isolate, context);
 
+  if (!FLAG_expose_wasm) {
+    return;
+  }
+
   // Bind the experimental WASM object.
   // TODO(rossberg, titzer): remove once it's no longer needed.
   {