Move IsStringASCII/UTF8 to base namespace.

base/i18n/streaming_utf8_validator_perftest.cc

Index: base/i18n/streaming_utf8_validator_perftest.cc
diff --git a/base/i18n/streaming_utf8_validator_perftest.cc b/base/i18n/streaming_utf8_validator_perftest.cc
index ac2eb0820bac01a3a172fb89236d92a9763562e9..a2ce2420c05e02be3d529f4f178a2c227b8d429c 100644
--- a/base/i18n/streaming_utf8_validator_perftest.cc
+++ b/base/i18n/streaming_utf8_validator_perftest.cc
@@ -56,6 +56,10 @@ bool IsString7Bit(const std::string& s) {
   return true;
 }
 
+bool IsStringUTF8(const std::string& s) {
+  return base::IsStringUTF8(s);
+}
+
 // Assumes that |previous| is a valid UTF-8 sequence, and attempts to return
 // the next one. Is just barely smart enough to iterate through the ranges
 // defined about.