[DevTools] Support multiple DevToolsMessageChunkProcessor instances

content/renderer/devtools/devtools_agent.cc

Index: content/renderer/devtools/devtools_agent.cc
diff --git a/content/renderer/devtools/devtools_agent.cc b/content/renderer/devtools/devtools_agent.cc
index a9b2b5929bb756df2ab7a1268eb8ba4a0f3251f7..675787f723c9a45000e025eaa693b900c787c08b 100644
--- a/content/renderer/devtools/devtools_agent.cc
+++ b/content/renderer/devtools/devtools_agent.cc
@@ -221,7 +221,7 @@ void DevToolsAgent::SendChunkedProtocolMessage(IPC::Sender* sender,
 
   for (size_t pos = 0; pos < message.length(); pos += kMaxMessageChunkSize) {
     chunk.is_last = pos + kMaxMessageChunkSize >= message.length();
-    chunk.session_id = chunk.is_last ? session_id : 0;
+    chunk.session_id = session_id;
     chunk.call_id = chunk.is_last ? call_id : 0;
     chunk.post_state = chunk.is_last ? post_state : std::string();
     chunk.data = message.substr(pos, kMaxMessageChunkSize);