Implement the 'noopener' window feature.

third_party/WebKit/Source/core/page/CreateWindow.cpp

Index: third_party/WebKit/Source/core/page/CreateWindow.cpp
diff --git a/third_party/WebKit/Source/core/page/CreateWindow.cpp b/third_party/WebKit/Source/core/page/CreateWindow.cpp
index df15797bc2575125351b4d05ec282a4f4956eab1..e3b638fc17785539a84eea0301f038ba93c447a6 100644
--- a/third_party/WebKit/Source/core/page/CreateWindow.cpp
+++ b/third_party/WebKit/Source/core/page/CreateWindow.cpp
@@ -155,11 +155,13 @@ DOMWindow* createWindow(const String& urlString, const AtomicString& frameName,
     // We pass the opener frame for the lookupFrame in case the active frame is different from
     // the opener frame, and the name references a frame relative to the opener frame.
     bool created;
-    Frame* newFrame = createWindow(*activeFrame, openerFrame, frameRequest, windowFeatures, NavigationPolicyIgnore, MaybeSetOpener, created);
+    ShouldSetOpener opener = windowFeatures.noopener ? NeverSetOpener : MaybeSetOpener;
+    Frame* newFrame = createWindow(*activeFrame, openerFrame, frameRequest, windowFeatures, NavigationPolicyIgnore, opener, created);
     if (!newFrame)
         return nullptr;
 
-    newFrame->client()->setOpener(&openerFrame);
+    if (!windowFeatures.noopener)
+        newFrame->client()->setOpener(&openerFrame);
 
     if (!newFrame->domWindow()->isInsecureScriptAccess(callingWindow, completedURL)) {
         if (!urlString.isEmpty() || created)