WebContents created via ctrl-click should be in a new process (target=_blank).

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

Index: third_party/WebKit/Source/core/loader/FrameLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.cpp b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
index c852f3a22322e7def1bdf773f53624557cb5ed30..bde3d1a7841a587a97bff85e06301baa914cd97b 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -987,12 +987,13 @@ void FrameLoader::Load(const FrameLoadRequest& passed_request,
     if (policy == kNavigationPolicyDownload) {
       Client()->LoadURLExternally(request.GetResourceRequest(),
                                   kNavigationPolicyDownload, String(), false);
-    } else {
+      return;  // Navigation/download will be handled by the client.
+    } else if (ShouldNavigateTargetFrame(policy)) {
       request.GetResourceRequest().SetFrameType(
           WebURLRequest::kFrameTypeAuxiliary);
       CreateWindowForRequest(request, *frame_, policy);
+      return;  // Navigation will be handled by the new frame/window.
     }
-    return;
   }
 
   if (!frame_->IsNavigationAllowed())