Move the warning banner of local disk shortage to the upper side.

BUG=409731,391703
TEST=manually

Review URL: https://codereview.chromium.org/531403002

Cr-Commit-Position: refs/heads/master@{#293086}

ui/file_manager/file_manager/foreground/css/file_manager.css

@@ -690,7 +690,7 @@ html[dir='rtl'] .breadcrumbs .separator {
   flex: none;
   flex-direction: row;
   font-size: 13px;
-  height: 57px;
+  height: 44px;
   overflow: hidden;
   padding-left: 57px;  /* Make space for the icon. */
   transition: height 70ms linear;

ui/file_manager/file_manager/main.html

@@ -332,6 +332,7 @@
                 <div class="drive-icon"></div>
                 <div class="drive-text" id="drive-auth-failed-warning-text"></div>
               </div>
+              <div class="downloads-warning" hidden></div>
               <div id="list-container">
                 <div class="detail-table" id="detail-table" tabindex="5" autofocus>
                 </div>
@@ -340,7 +341,6 @@
                 <div class="drive-welcome page"></div>
                 <div id="no-search-results"></div>
               </div>
-              <div class="downloads-warning" hidden></div>
             </div>
           </div>
           <div class="preview-panel progressable" visibility="hidden">