Add request_id to HttpRequestInfo and pass it to the NetworkDelegate for events.

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index 68e5138892571e174055970b7845a9ff3c067e29..4f3be8fe898c2abcef226e346e0f9dba7302277c 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -51,9 +51,12 @@ bool ChromeNetworkDelegate::OnBeforeURLRequest(
       profile_id_, event_router_.get(), request, callback);
 }
 
-void ChromeNetworkDelegate::OnSendHttpRequest(
-    net::HttpRequestHeaders* headers) {
-  DCHECK(headers);
+bool ChromeNetworkDelegate::OnBeforeSendHeaders(
+    uint64 request_id,
+    net::HttpRequestHeaders* headers,
+    net::CompletionCallback* callback) {
+  return ExtensionWebRequestEventRouter::GetInstance()->OnBeforeSendHeaders(
+      profile_id_, event_router_.get(), request_id, headers, callback);
 }
 
 void ChromeNetworkDelegate::OnResponseStarted(net::URLRequest* request) {