RemoteBridgeFrameOwner: keep better track of the attached frame

third_party/WebKit/Source/core/loader/FrameFetchContextTest.cpp

Index: third_party/WebKit/Source/core/loader/FrameFetchContextTest.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameFetchContextTest.cpp b/third_party/WebKit/Source/core/loader/FrameFetchContextTest.cpp
index 22c206f078a09a3c74fea5f3f19a42c22d2ac78b..2a382839bf710eaa9360d6e27e3178d6a13ab0e5 100644
--- a/third_party/WebKit/Source/core/loader/FrameFetchContextTest.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameFetchContextTest.cpp
@@ -72,25 +72,6 @@ private:
     RawPtrWillBeMember<Frame> m_parent;
 };
 
-class StubFrameOwner : public NoBaseWillBeGarbageCollectedFinalized<StubFrameOwner>, public FrameOwner {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(StubFrameOwner);
-public:
-    static PassOwnPtrWillBeRawPtr<StubFrameOwner> create()
-    {
-        return adoptPtrWillBeNoop(new StubFrameOwner);
-    }
-
-    DEFINE_INLINE_VIRTUAL_TRACE() { FrameOwner::trace(visitor); }
-
-    bool isLocal() const override { return false; }
-    SandboxFlags getSandboxFlags() const override { return SandboxNone; }
-    void dispatchLoad() override { }
-    void renderFallbackContent() override { }
-    ScrollbarMode scrollingMode() const override { return ScrollbarAuto; }
-    int marginWidth() const override { return -1; }
-    int marginHeight() const override { return -1; }
-};
-
 class MockFrameLoaderClient : public EmptyFrameLoaderClient {
 public:
     MockFrameLoaderClient()