Fix errors when building android with coverage=1

net/base/net_util.cc

Index: net/base/net_util.cc
diff --git a/net/base/net_util.cc b/net/base/net_util.cc
index 3d4924aff14605ac270b941ea48f714df16ed3e6..06f648c6a737981ed5c6890463f8beb70dcb01c4 100644
--- a/net/base/net_util.cc
+++ b/net/base/net_util.cc
@@ -267,7 +267,7 @@ bool IsComponentCoveredByLang(const icu::UnicodeSet& component_characters,
                               const std::string& lang) {
   CR_DEFINE_STATIC_LOCAL(
       const icu::UnicodeSet, kASCIILetters, ('a', 'z'));
-  icu::UnicodeSet* lang_set;
+  icu::UnicodeSet* lang_set = NULL;
   // We're called from both the UI thread and the history thread.
   {
     base::AutoLock lock(g_lang_set_lock.Get());