Cleanup: Remove unused variables in chrome/ found by Scythe.

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 8a9a863ed234f8df2cb1ee9eb53961f479311a4a..20372d3c5b61aef8f60ac93933cc25b3e083eea5 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -294,8 +294,7 @@ ChromeNetworkDelegate::ChromeNetworkDelegate(
       domain_reliability_monitor_(NULL),
       experimental_web_platform_features_enabled_(
           base::CommandLine::ForCurrentProcess()->HasSwitch(
-              switches::kEnableExperimentalWebPlatformFeatures)),
-      first_request_(true) {
+              switches::kEnableExperimentalWebPlatformFeatures)) {
   DCHECK(enable_referrers);
   extensions_delegate_.reset(
       ChromeExtensionsNetworkDelegate::Create(event_router));