Set the target type when creating the request for main resource

Source/web/FrameLoaderClientImpl.cpp

Index: Source/web/FrameLoaderClientImpl.cpp
diff --git a/Source/web/FrameLoaderClientImpl.cpp b/Source/web/FrameLoaderClientImpl.cpp
index d3039f99bc06a58b3ebb82c351da83002c21677c..18a1a281718e8bc731c0ff32098406a83ac250c6 100644
--- a/Source/web/FrameLoaderClientImpl.cpp
+++ b/Source/web/FrameLoaderClientImpl.cpp
@@ -604,8 +604,9 @@ PassRefPtr<LocalFrame> FrameLoaderClientImpl::createFrame(
     const Referrer& referrer,
     HTMLFrameOwnerElement* ownerElement)
 {
-    FrameLoadRequest frameRequest(m_webFrame->frame()->document(),
-        ResourceRequest(url, referrer), name);
+    ResourceRequest request = ResourceRequest(url, referrer);
+    request.initializeForMainResource(false);
+    FrameLoadRequest frameRequest(m_webFrame->frame()->document(), request, name);
     return m_webFrame->createChildFrame(frameRequest, ownerElement);
 }