Revert of [CacheStorage] [IndexedDB] [DevTools] Added refresh button to...

Revert of [CacheStorage] [IndexedDB] [DevTools] Added refresh button to category view of cache storage and in… (patchset #2 id:20001 of https://codereview.chromium.org/2916193003/ )

Reason for revert:
The UI does not look right.

Original issue's description:
> Added refresh button to category view of cache storage and indexeddb
>
> BUG=727920, 727897
>
> Review-Url: https://codereview.chromium.org/2916193003
> Cr-Commit-Position: refs/heads/master@{#478099}
> Committed: https://chromium.googlesource.com/chromium/src/+/423c0eff455de15f2e3f0cc6c54002fa9b7db5a6

TBR=dmurph@chromium.org,dgozman@chromium.org,eostroukhov@chromium.org,kristipark@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=727920, 727897

Review-Url: https://codereview.chromium.org/2973113002
Cr-Commit-Position: refs/heads/master@{#485447}

third_party/WebKit/Source/devtools/front_end/resources/ApplicationPanelSidebar.js

@@ -57,7 +57,6 @@ Resources.ApplicationPanelSidebar = class extends UI.VBox {
     this._applicationTreeElement.appendChild(clearStorageTreeElement);
 
     var storageTreeElement = this._addSidebarSection(Common.UIString('Storage'));
-    this._addRefreshSectionButton(storageTreeElement, this._refreshStorageSection.bind(this));
     this.localStorageListTreeElement =
         new Resources.StorageCategoryTreeElement(panel, Common.UIString('Local Storage'), 'LocalStorage');
     var localStorageIcon = UI.Icon.create('mediumicon-table', 'resource-tree-item');
@@ -84,7 +83,6 @@ Resources.ApplicationPanelSidebar = class extends UI.VBox {
     storageTreeElement.appendChild(this.cookieListTreeElement);
 
     var cacheTreeElement = this._addSidebarSection(Common.UIString('Cache'));
-    this._addRefreshSectionButton(cacheTreeElement, this._refreshCacheSection.bind(this));
     this.cacheStorageListTreeElement = new Resources.ServiceWorkerCacheTreeElement(panel);
     cacheTreeElement.appendChild(this.cacheStorageListTreeElement);
     this.applicationCacheListTreeElement =
@@ -132,32 +130,6 @@ Resources.ApplicationPanelSidebar = class extends UI.VBox {
     return treeElement;
   }
 
-  /**
-   * @param {!UI.TreeElement} treeElement
-   * @param {function()} refresh
-   */
-  _addRefreshSectionButton(treeElement, refresh) {
-    var refreshIcon = UI.Icon.create('largeicon-refresh', 'sidebar-section-button');
-    refreshIcon.addEventListener('click', refresh, false);
-    treeElement.setTrailingIcons([refreshIcon]);
-  }
-
-  _refreshStorageSection() {
-    var visibleView = this._panel.visibleView;
-    if (visibleView instanceof Resources.DOMStorageItemsView || visibleView instanceof Resources.CookieItemsView) {
-      // Local Storage, Session Storage || Cookies
-      visibleView.refreshItems();
-    } else if (visibleView instanceof Resources.DatabaseTableView) {
-      // Web SQL
-      visibleView.update();
-    }
-    this.indexedDBListTreeElement.refreshIndexedDB();
-  }
-
-  _refreshCacheSection() {
-    this.cacheStorageListTreeElement._refreshCaches();
-  }
-
   /**
    * @override
    * @param {!SDK.Target} target

third_party/WebKit/Source/devtools/front_end/resources/resourcesSidebar.css

@@ -26,21 +26,6 @@ li.storage-group-list-item::before {
     display: none;
 }
 
-li.storage-group-list-item
-.trailing-icons {
-    width: 14px;
-    height: 14px;
-    margin-left: 6px;
-}
-
-li.storage-group-list-item
-.trailing-icons
-.sidebar-section-button {
-    position: relative;
-    top: -1px;
-    left: -8px;
-}
-
 .navigator-tree-item {
     margin: -3px -7px -3px -7px;
 }