Move unique name generation and tracking into //content.

third_party/WebKit/Source/web/WebFrame.cpp

Index: third_party/WebKit/Source/web/WebFrame.cpp
diff --git a/third_party/WebKit/Source/web/WebFrame.cpp b/third_party/WebKit/Source/web/WebFrame.cpp
index 943f73840668f5e565edc7011d5627d5dbd4723e..008197e8e3a0297beb806e17332f4fd406c679b6 100644
--- a/third_party/WebKit/Source/web/WebFrame.cpp
+++ b/third_party/WebKit/Source/web/WebFrame.cpp
@@ -69,7 +69,6 @@ bool WebFrame::swap(WebFrame* frame) {
 
   FrameHost* host = oldFrame->host();
   AtomicString name = oldFrame->tree().name();
-  AtomicString uniqueName = oldFrame->tree().uniqueName();
   FrameOwner* owner = oldFrame->owner();
 
   v8::HandleScope handleScope(v8::Isolate::GetCurrent());
@@ -101,8 +100,7 @@ bool WebFrame::swap(WebFrame* frame) {
       localFrame.page()->setMainFrame(&localFrame);
     }
   } else {
-    toWebRemoteFrameImpl(frame)->initializeCoreFrame(host, owner, name,
-                                                     uniqueName);
+    toWebRemoteFrameImpl(frame)->initializeCoreFrame(host, owner, name);
   }
 
   if (oldFrame->hasReceivedUserGesture())