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

net/base/host_cache_unittest.cc

 // Copyright (c) 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 "net/base/host_cache.h"
 
+#include "base/format_macros.h"
 #include "base/stl_util-inl.h"
 #include "base/string_util.h"
 #include "net/base/net_errors.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 
 namespace {
 const int kMaxCacheEntries = 10;
 const int kCacheDurationMs = 10000;  // 10 seconds.
@@ skipping 278 matching lines @@
       1
     },
     {
       HostCache::Key("host1", ADDRESS_FAMILY_UNSPECIFIED),
       HostCache::Key("host2", ADDRESS_FAMILY_IPV4),
       -1
     },
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
-    SCOPED_TRACE(StringPrintf("Test[%d]", i));
+    SCOPED_TRACE(StringPrintf("Test[%" PRIuS "]", i));
 
     const HostCache::Key& key1 = tests[i].key1;
     const HostCache::Key& key2 = tests[i].key2;
 
     switch (tests[i].expected_comparison) {
       case -1:
         EXPECT_TRUE(key1 < key2);
         EXPECT_FALSE(key2 < key1);
         EXPECT_FALSE(key2 == key1);
         break;
       case 0:
         EXPECT_FALSE(key1 < key2);
         EXPECT_FALSE(key2 < key1);
         EXPECT_TRUE(key2 == key1);
         break;
       case 1:
         EXPECT_FALSE(key1 < key2);
         EXPECT_TRUE(key2 < key1);
         EXPECT_FALSE(key2 == key1);
         break;
       default:
         FAIL() << "Invalid expectation. Can be only -1, 0, 1";
     }
   }
 }
 
 }  // namespace net