Do not suppress referrers for '<a ... rel="noopener">'.

third_party/WebKit/Source/core/page/ChromeClient.h

Index: third_party/WebKit/Source/core/page/ChromeClient.h
diff --git a/third_party/WebKit/Source/core/page/ChromeClient.h b/third_party/WebKit/Source/core/page/ChromeClient.h
index 2fbe9321c3fee26b32e4b94913affab1d4d814c2..d80286ed36603dbe5e1d0dfb1f816e9e1d2bb844 100644
--- a/third_party/WebKit/Source/core/page/ChromeClient.h
+++ b/third_party/WebKit/Source/core/page/ChromeClient.h
@@ -110,7 +110,7 @@ public:
     // created Page has its show method called.
     // The FrameLoadRequest parameter is only for ChromeClient to check if the
     // request could be fulfilled. The ChromeClient should not load the request.
-    virtual Page* createWindow(LocalFrame*, const FrameLoadRequest&, const WindowFeatures&, NavigationPolicy, ShouldSetOpener) = 0;
+    virtual Page* createWindow(LocalFrame*, const FrameLoadRequest&, const WindowFeatures&, NavigationPolicy) = 0;
     virtual void show(NavigationPolicy = NavigationPolicyIgnore) = 0;
 
     void setWindowFeatures(const WindowFeatures&);