Fix an uninitialized warning treated as error on gcc 4.5.2

net/url_request/url_request_unittest.cc

Index: net/url_request/url_request_unittest.cc
diff --git a/net/url_request/url_request_unittest.cc b/net/url_request/url_request_unittest.cc
index fc0645a3b07141b7277336b46c6ff9fbd3185c81..9fd411ea4df83595f78bbcd634c3baee9f1bec16 100644
--- a/net/url_request/url_request_unittest.cc
+++ b/net/url_request/url_request_unittest.cc
@@ -1552,7 +1552,7 @@ TEST_F(HTTPSOCSPTest, Valid) {
   TestServer::HTTPSOptions https_options(TestServer::HTTPSOptions::CERT_AUTO);
   https_options.ocsp_status = TestServer::HTTPSOptions::OCSP_OK;
 
-  CertStatus cert_status;
+  CertStatus cert_status = 0;
   DoConnection(https_options, &cert_status);
 
   EXPECT_EQ(0u, cert_status & CERT_STATUS_ALL_ERRORS);