Remove unused repo store keys

Fix
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12198#note_37147332

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

@@ -148,7 +148,6 @@ const RepoHelper = {
         Store.binary = data.binary;
 
         if (data.binary) {
-          Store.binaryMimeType = data.mime_type;
           // file might be undefined
           RepoHelper.setBinaryDataAsBase64(data);
           Store.setViewToPreview();

app/assets/javascripts/repo/stores/repo_store.js

@@ -3,13 +3,10 @@ import Helper from '../helpers/repo_helper';
 import Service from '../services/repo_service';
 
 const RepoStore = {
-  ideEl: {},
   monaco: {},
   monacoLoading: false,
   monacoInstance: {},
   service: '',
-  editor: '',
-  sidebar: '',
   editMode: false,
   isTree: false,
   isRoot: false,
@@ -17,18 +14,10 @@ const RepoStore = {
   projectId: '',
   projectName: '',
   projectUrl: '',
-  trees: [],
-  blobs: [],
-  submodules: [],
   blobRaw: '',
-  blobRendered: '',
   currentBlobView: 'repo-preview',
   openedFiles: [],
-  tabSize: 100,
-  defaultTabSize: 100,
-  minTabSize: 30,
   submitCommitsLoading: false,
-  binaryLoaded: false,
   dialog: {
     open: false,
     title: '',
@@ -44,9 +33,6 @@ const RepoStore = {
   currentBranch: '',
   targetBranch: 'new-branch',
   commitMessage: '',
-  binaryMimeType: '',
-  // scroll bar space for windows
-  scrollWidth: 0,
   binaryTypes: {
     png: false,
     md: false,
@@ -57,7 +43,6 @@ const RepoStore = {
     tree: false,
     blob: false,
   },
-  readOnly: true,
 
   resetBinaryTypes() {
     Object.keys(RepoStore.binaryTypes).forEach((key) => {
@@ -95,7 +80,6 @@ const RepoStore = {
 
     if (file.binary) {
       RepoStore.blobRaw = file.base64;
-      RepoStore.binaryMimeType = file.mime_type;
     } else if (file.newContent || file.plain) {
       RepoStore.blobRaw = file.newContent || file.plain;
     } else {
@@ -237,4 +221,5 @@ const RepoStore = {
     return RepoStore.currentBlobView === 'repo-preview';
   },
 };
+
 export default RepoStore;