Move EqualsASCII to the base namespace.

base/strings/string_util.cc

Index: base/strings/string_util.cc
diff --git a/base/strings/string_util.cc b/base/strings/string_util.cc
index 9fd823aa964e847619c55f53800238c270e368f0..cc7769343b5a592a2d081c89e3203dc82be8f720 100644
--- a/base/strings/string_util.cc
+++ b/base/strings/string_util.cc
@@ -476,14 +476,14 @@ bool LowerCaseEqualsASCII(const char16* a_begin,
   return DoLowerCaseEqualsASCII(a_begin, a_end, b);
 }
 
-}  // namespace base
-
-bool EqualsASCII(const string16& a, const base::StringPiece& b) {
+bool EqualsASCII(const string16& a, const StringPiece& b) {
   if (a.length() != b.length())
     return false;
   return std::equal(b.begin(), b.end(), a.begin());
 }
 
+}  // namespace base
+
 bool StartsWithASCII(const std::string& str,
                      const std::string& search,
                      bool case_sensitive) {