Move unique name generation and tracking into //content.

content/renderer/render_frame_proxy.cc

Index: content/renderer/render_frame_proxy.cc
diff --git a/content/renderer/render_frame_proxy.cc b/content/renderer/render_frame_proxy.cc
index 0315b29a3edd8ec0fa6dbb23ec0c2416b95103e2..bbd2170e544bbe40ee2dc39d5793f51822eb9e46 100644
--- a/content/renderer/render_frame_proxy.cc
+++ b/content/renderer/render_frame_proxy.cc
@@ -125,8 +125,8 @@ RenderFrameProxy* RenderFrameProxy::CreateFrameProxy(
     web_frame = parent->web_frame()->createRemoteChild(
         replicated_state.scope,
         blink::WebString::fromUTF8(replicated_state.name),
-        blink::WebString::fromUTF8(replicated_state.unique_name),
         replicated_state.sandbox_flags, proxy.get(), opener);
+    proxy->unique_name_ = replicated_state.unique_name;
     render_view = parent->render_view();
     render_widget = parent->render_widget();
   }
@@ -219,8 +219,7 @@ void RenderFrameProxy::SetReplicatedState(const FrameReplicationState& state) {
   DCHECK(web_frame_);
   web_frame_->setReplicatedOrigin(state.origin);
   web_frame_->setReplicatedSandboxFlags(state.sandbox_flags);
-  web_frame_->setReplicatedName(blink::WebString::fromUTF8(state.name),
-                                blink::WebString::fromUTF8(state.unique_name));
+  web_frame_->setReplicatedName(blink::WebString::fromUTF8(state.name));
   web_frame_->setReplicatedInsecureRequestPolicy(state.insecure_request_policy);
   web_frame_->setReplicatedPotentiallyTrustworthyUniqueOrigin(
       state.has_potentially_trustworthy_unique_origin);
@@ -346,8 +345,8 @@ void RenderFrameProxy::OnDispatchLoad() {
 
 void RenderFrameProxy::OnDidUpdateName(const std::string& name,
                                        const std::string& unique_name) {
-  web_frame_->setReplicatedName(blink::WebString::fromUTF8(name),
-                                blink::WebString::fromUTF8(unique_name));
+  web_frame_->setReplicatedName(blink::WebString::fromUTF8(name));
+  unique_name_ = unique_name;
 }
 
 void RenderFrameProxy::OnAddContentSecurityPolicy(