Remove some legacy versions of StartsWith and EndsWith.

extensions/common/user_script.cc

Index: extensions/common/user_script.cc
diff --git a/extensions/common/user_script.cc b/extensions/common/user_script.cc
index b3d82bba795a04871921edebe6adc55552311be2..6b64741924170006e4ee28814aba76ffb5936ab8 100644
--- a/extensions/common/user_script.cc
+++ b/extensions/common/user_script.cc
@@ -52,7 +52,8 @@ int UserScript::GenerateUserScriptID() {
 
 bool UserScript::IsURLUserScript(const GURL& url,
                                  const std::string& mime_type) {
-  return base::EndsWith(url.ExtractFileName(), kFileExtension, false) &&
+  return base::EndsWith(url.ExtractFileName(), kFileExtension,
+                        base::CompareCase::INSENSITIVE_ASCII) &&
          mime_type != "text/html";
 }