Cleanup various WebView/WebFrame APIs to properly handle remote frames.

Source/core/frame/Frame.cpp

Index: Source/core/frame/Frame.cpp
diff --git a/Source/core/frame/Frame.cpp b/Source/core/frame/Frame.cpp
index db3f719f5951b14d8bae71fdb31142411de8e2df..83682e7620a39dc4507b495c89c3e04fc7442cad 100644
--- a/Source/core/frame/Frame.cpp
+++ b/Source/core/frame/Frame.cpp
@@ -73,6 +73,11 @@ Frame::Frame(FrameClient* client, FrameHost* host, FrameOwner* owner)
         page()->incrementSubframeCount();
         if (m_owner->isLocal())
             toHTMLFrameOwnerElement(m_owner)->setContentFrame(*this);
+    } else {
+        // Setting the main frame takes a reference to this object, before it's
+        // adopted.
+        relaxAdoptionRequirement();

[eseidel, 2014/06/17 18:00:29]

I find it difficult to imagine why this function exists, let alone that we would
ever want to call it. :)

+        page()->setMainFrame(this);
     }
 }