Replace base::str[n]casecmp with helper functions.

mojo/services/network/http_connection_impl.cc

Index: mojo/services/network/http_connection_impl.cc
diff --git a/mojo/services/network/http_connection_impl.cc b/mojo/services/network/http_connection_impl.cc
index 2df12aa7b50d7b63d392f4bf2514a911ff8c954c..ad3347d9d43ca72ec98a0e0860a33f8f1fb81b95 100644
--- a/mojo/services/network/http_connection_impl.cc
+++ b/mojo/services/network/http_connection_impl.cc
@@ -375,11 +375,12 @@ void HttpConnectionImpl::OnFinishedReadingResponseBody(
       //
       // TODO(yzshen): Consider adding to net::HttpServerResponseInfo a simple
       // setter for body which doesn't fiddle with headers.
-      if (base::strcasecmp(header.name.data(),
-                           net::HttpRequestHeaders::kContentLength) == 0) {
+      base::StringPiece name_piece(header.name.data(), header.name.size());
+      if (base::EqualsCaseInsensitiveASCII(
+              name_piece, net::HttpRequestHeaders::kContentLength)) {
         continue;
-      } else if (base::strcasecmp(header.name.data(),
-                                  net::HttpRequestHeaders::kContentType) == 0) {
+      } else if (base::EqualsCaseInsensitiveASCII(
+                     name_piece, net::HttpRequestHeaders::kContentType)) {
         content_type = header.value;
         continue;
       }