Extract debugger target enumeration into a separate class

content/browser/devtools/devtools_agent_host_impl.cc

Index: content/browser/devtools/devtools_agent_host_impl.cc
diff --git a/content/browser/devtools/devtools_agent_host_impl.cc b/content/browser/devtools/devtools_agent_host_impl.cc
index 0474103a4232e1c39c790fda2d4acd26b2442466..001751098c457f58ea9ba630c50861238fb6942e 100644
--- a/content/browser/devtools/devtools_agent_host_impl.cc
+++ b/content/browser/devtools/devtools_agent_host_impl.cc
@@ -5,6 +5,7 @@
 #include "content/browser/devtools/devtools_agent_host_impl.h"
 
 #include "base/basictypes.h"
+#include "base/stringprintf.h"
 #include "content/common/devtools_messages.h"
 
 namespace content {
@@ -15,7 +16,7 @@ static int g_next_agent_host_id = 0;
 
 DevToolsAgentHostImpl::DevToolsAgentHostImpl()
     : close_listener_(NULL),
-      id_(++g_next_agent_host_id) {
+      id_(base::StringPrintf("%d", ++g_next_agent_host_id)) {
 }
 
 void DevToolsAgentHostImpl::Attach() {