DevTools: use per-LocalFrame instrumenting agents instead of per-Page ones.

Source/web/WebDevToolsAgentImpl.cpp

Index: Source/web/WebDevToolsAgentImpl.cpp
diff --git a/Source/web/WebDevToolsAgentImpl.cpp b/Source/web/WebDevToolsAgentImpl.cpp
index 7b0c2201963d37d3b702cac3569baf7736d3e2f7..078cb1ab11280a84d934cff71449c9ce225d9e83 100644
--- a/Source/web/WebDevToolsAgentImpl.cpp
+++ b/Source/web/WebDevToolsAgentImpl.cpp
@@ -112,14 +112,14 @@ private:
         , m_messageLoop(messageLoop) { }
 
 
-    virtual void run(Page* page)
+    virtual void run(LocalFrame* frame)
     {
         if (m_running)
             return;
         m_running = true;
 
         // 0. Flush pending frontend messages.
-        WebViewImpl* viewImpl = WebViewImpl::fromPage(page);
+        WebViewImpl* viewImpl = WebViewImpl::fromPage(frame->page());
         WebDevToolsAgentImpl* agent = static_cast<WebDevToolsAgentImpl*>(viewImpl->devToolsAgent());
         agent->flushPendingProtocolNotifications();