Move StringToLowerASCII to base namespace

extensions/common/permissions/socket_permission_entry.cc

Index: extensions/common/permissions/socket_permission_entry.cc
diff --git a/extensions/common/permissions/socket_permission_entry.cc b/extensions/common/permissions/socket_permission_entry.cc
index ba409c58f149c7d9cf9dbb8fb94e0604e6743f6a..76afe23771f3ba1f814aedfa9177830492f72a8a 100644
--- a/extensions/common/permissions/socket_permission_entry.cc
+++ b/extensions/common/permissions/socket_permission_entry.cc
@@ -75,7 +75,7 @@ bool SocketPermissionEntry::Check(
   if (pattern_.type != request.type)
     return false;
 
-  std::string lhost = StringToLowerASCII(request.host);
+  std::string lhost = base::StringToLowerASCII(request.host);
   if (pattern_.host != lhost) {
     if (!match_subdomains_)
       return false;
@@ -165,7 +165,7 @@ bool SocketPermissionEntry::ParseHostPattern(
   if (!result.pattern_.host.empty()) {
     if (StartsOrEndsWithWhitespace(result.pattern_.host))
       return false;
-    result.pattern_.host = StringToLowerASCII(result.pattern_.host);
+    result.pattern_.host = base::StringToLowerASCII(result.pattern_.host);
 
     // The first component can optionally be '*' to match all subdomains.
     std::vector<std::string> host_components;