Add compiler-specific "examine printf format" attributes to printfs.

chrome/browser/net/chrome_url_request_context_unittest.cc

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "chrome/browser/net/chrome_url_request_context.h"
+
 #include "base/command_line.h"
-#include "chrome/browser/net/chrome_url_request_context.h"
+#include "base/format_macros.h"
 #include "chrome/common/chrome_switches.h"
 #include "net/proxy/proxy_config.h"
 #include "net/proxy/proxy_config_service_common_unittest.h"
-
 #include "testing/gtest/include/gtest/gtest.h"
 
 // Builds an identifier for each test in an array.
 #define TEST_DESC(desc) StringPrintf("at line %d <%s>", __LINE__, desc)
 
 TEST(ChromeUrlRequestContextTest, CreateProxyConfigTest) {
   FilePath unused_path(FILE_PATH_LITERAL("foo.exe"));
   // Build the input command lines here.
   CommandLine empty(unused_path);
   CommandLine no_proxy(unused_path);
@@ skipping 135 matching lines @@
       false,                                              // is_null
       true,                                               // auto_detect
       GURL(),                                             // pac_url
       net::ProxyConfig::ProxyRules(),                     // proxy_rules
       "",                                                 // proxy_bypass_list
       false                                               // bypass_local_names
     }
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); i++) {
-    SCOPED_TRACE(StringPrintf("Test[%d] %s", i, tests[i].description.c_str()));
+    SCOPED_TRACE(StringPrintf("Test[%" PRIuS "] %s", i,
+                              tests[i].description.c_str()));
     scoped_ptr<net::ProxyConfig> config(CreateProxyConfig(
         CommandLine(tests[i].command_line)));
 
     if (tests[i].is_null) {
       EXPECT_TRUE(config == NULL);
     } else {
       EXPECT_TRUE(config != NULL);
       EXPECT_EQ(tests[i].auto_detect, config->auto_detect);
       EXPECT_EQ(tests[i].pac_url, config->pac_url);
       EXPECT_EQ(tests[i].proxy_bypass_list,
                 net::FlattenProxyBypass(config->proxy_bypass));
       EXPECT_EQ(tests[i].bypass_local_names, config->proxy_bypass_local_names);
       EXPECT_EQ(tests[i].proxy_rules, config->proxy_rules);
     }
   }
 }