Fix iOS build for XCode 4.6.

chrome/browser/net/connection_tester.cc

Index: chrome/browser/net/connection_tester.cc
diff --git a/chrome/browser/net/connection_tester.cc b/chrome/browser/net/connection_tester.cc
index 2f9ecabe47bb013fee99e8491f36985fecb4f7c7..f5e892b6dcb05b187d575d71b365806386729b40 100644
--- a/chrome/browser/net/connection_tester.cc
+++ b/chrome/browser/net/connection_tester.cc
@@ -50,8 +50,10 @@ namespace {
 class ExperimentURLRequestContext : public net::URLRequestContext {
  public:
   explicit ExperimentURLRequestContext(
-      net::URLRequestContext* proxy_request_context)
-      : proxy_request_context_(proxy_request_context),
+      net::URLRequestContext* proxy_request_context) :
+#if !defined(OS_IOS)
+        proxy_request_context_(proxy_request_context),
+#endif
         ALLOW_THIS_IN_INITIALIZER_LIST(storage_(this)),
         ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {}
 
@@ -286,7 +288,9 @@ class ExperimentURLRequestContext : public net::URLRequestContext {
 #endif
   }
 
+#if !defined(OS_IOS)
   net::URLRequestContext* const proxy_request_context_;
+#endif
   net::URLRequestContextStorage storage_;
   base::WeakPtrFactory<ExperimentURLRequestContext> weak_factory_;
 };