Remove unused getBranch method.

Conflicts:
	app/assets/javascripts/repo/helpers/repo_helper.js

app/assets/javascripts/repo/components/repo_commit_section.vue

@@ -28,7 +28,7 @@ const RepoCommitSection = {
   methods: {
     makeCommit() {
       // see https://docs.gitlab.com/ce/api/commits.html#create-a-commit-with-multiple-files-and-actions
-      const branch = Helper.getBranch();
+      const branch = Store.currentBranch;
       const commitMessage = this.commitMessage;
       const actions = this.changedFiles.map(f => ({
         action: 'update',

app/assets/javascripts/repo/helpers/repo_helper.js

@@ -33,8 +33,8 @@ const RepoHelper = {
   ? window.performance
   : Date,
 
-  getBranch() {
-    return $('button.dropdown-menu-toggle').attr('data-ref');
+  getFileExtension(fileName) {
+    return fileName.split('.').pop();
   },
 
   getLanguageIDForFile(file, langs) {