[bindings] partial interfaces should not violate componentization

Source/web/WebTestingSupport.cpp

Index: Source/web/WebTestingSupport.cpp
diff --git a/Source/web/WebTestingSupport.cpp b/Source/web/WebTestingSupport.cpp
index 70920fdf2e31a29b3cdf98c43bb257415ef3d7d2..6ea35576bbf347e90d72a96dc1e9e88a5b201296 100644
--- a/Source/web/WebTestingSupport.cpp
+++ b/Source/web/WebTestingSupport.cpp
@@ -26,6 +26,7 @@
 #include "config.h"
 #include "public/web/WebTestingSupport.h"
 
+#include "bindings/modules/v8/V8InternalsPartial.h"
 #include "core/testing/v8/WebCoreTestSupport.h"
 #include "public/web/WebLocalFrame.h"
 #include <v8/include/v8.h>
@@ -34,6 +35,7 @@ namespace blink {
 
 void WebTestingSupport::injectInternalsObject(WebLocalFrame* frame)
 {
+    V8InternalsPartial::initialize();
     v8::HandleScope handleScope(v8::Isolate::GetCurrent());
     WebCoreTestSupport::injectInternalsObject(frame->mainWorldScriptContext());
 }