Use C99 standard format macros for 64-bit values.

chrome/common/ipc_message_utils.h

Index: chrome/common/ipc_message_utils.h
diff --git a/chrome/common/ipc_message_utils.h b/chrome/common/ipc_message_utils.h
index 2ae2ab5cdbd4b244250f3720befd71cc9585c063..bcc849a869d1a43740d1d732d033d9a2424d2f81 100644
--- a/chrome/common/ipc_message_utils.h
+++ b/chrome/common/ipc_message_utils.h
@@ -10,8 +10,9 @@
 #include <map>
 
 #include "base/file_path.h"
-#include "base/string_util.h"
+#include "base/format_macros.h"
 #include "base/string16.h"
+#include "base/string_util.h"
 #include "base/tuple.h"
 #if defined(OS_POSIX)
 #include "chrome/common/file_descriptor_set_posix.h"
@@ -218,7 +219,7 @@ struct ParamTraits<int64> {
     return m->ReadInt64(iter, r);
   }
   static void Log(const param_type& p, std::wstring* l) {
-    l->append(StringPrintf(L"%I64d", p));
+    l->append(StringPrintf(L"%" WidePRId64, p));
   }
 };
 
@@ -232,7 +233,7 @@ struct ParamTraits<uint64> {
     return m->ReadInt64(iter, reinterpret_cast<int64*>(r));
   }
   static void Log(const param_type& p, std::wstring* l) {
-    l->append(StringPrintf(L"%I64u", p));
+    l->append(StringPrintf(L"%" WidePRId64, p));
   }
 };