Move more string_util functions to base namespace.

sql/connection.cc

Index: sql/connection.cc
diff --git a/sql/connection.cc b/sql/connection.cc
index b17457b38e8affa0a0ba0eafc73d26a653afdbf7..d1b104908c988089729ae0050f9aff7da7016f7f 100644
--- a/sql/connection.cc
+++ b/sql/connection.cc
@@ -812,7 +812,7 @@ int Connection::ExecuteAndReturnErrorCode(const char* sql) {
     // sqlite3_exec() does this, presumably to avoid spinning the parser for
     // trailing whitespace.
     // TODO(shess): Audit to see if this can become a DCHECK.
-    while (IsAsciiWhitespace(*sql)) {
+    while (base::IsAsciiWhitespace(*sql)) {
       sql++;
     }