Revert "Hide filename edit field when there is no image"

This reverts commit d270ec39.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 596972 as the
culprit for flakes in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vZDI3MGVjMzkwMmFmZTU4OTg4MjM0ODMyYjdjMzNmN2U1Y2U5MmFhNgw

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.chromiumos/linux-chromeos-dbg/8178

Sample Failed Step: viz_browser_tests

Sample Flaky Test: GalleryBrowserTest.DeleteSingleOpenPhotoOnDownloads

Original change's description:
> Hide filename edit field when there is no image
> 
> Hide |filenameEdit_| line edit box when there is no image to be displayed.
> This fixes an undesired grey line appearing as the bottom of this edit box.
> Changing the "disabled" state doesn't change the style of this box,
> "disabled" state is only used for read-only behaviour not style.
> 
> R=fukino@chromium.org
> 
> Bug: 796503
> Change-Id: I6fc9a4eb218231781325ba7a5af992b12610b929
> Reviewed-on: https://chromium-review.googlesource.com/c/1212263
> Reviewed-by: Noel Gordon <noel@chromium.org>
> Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
> Commit-Queue: Alexander Nohe <nohe@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#596972}

Change-Id: I5a64c57351cc39d641af6052567c8f8d150542cc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 796503, 892543
Reviewed-on: https://chromium-review.googlesource.com/c/1263887
Cr-Commit-Position: refs/heads/master@{#597033}

chrome/browser/chromeos/file_manager/gallery_browsertest.cc

@@ -330,9 +330,4 @@ IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, ActivateVideoFromThumbnailMode) {
   StartTest();
 }
 
-IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, DeleteSingleOpenPhotoOnDownloads) {
-  set_test_case_name("deleteSingleOpenPhotoOnDownloads");
-  StartTest();
-}
-
 }  // namespace file_manager

ui/file_manager/gallery/js/gallery.js

@@ -814,9 +814,6 @@ Gallery.prototype.updateSelectionAndState_ = function() {
     selectedItem.touch();
     this.dataModel_.evictCache();
 
-    // Filename Edit field shows for anything selected.
-    this.filenameEdit_.hidden = false;
-
     // Update the title and the display name.
     if (numSelectedItems === 1) {
       document.title = this.selectedEntry_.name;
@@ -844,7 +841,6 @@ Gallery.prototype.updateSelectionAndState_ = function() {
     }
   } else {
     document.title = '';
-    this.filenameEdit_.hidden = true;
     this.filenameEdit_.disabled = true;
     this.filenameEdit_.value = '';
     this.resizeRenameField_();
@@ -1104,4 +1100,4 @@ if (document.readyState === 'loading') {
   document.addEventListener('DOMContentLoaded', initializeGallery);
 } else {
   initializeGallery();
-}
+}
\ No newline at end of file

ui/file_manager/integration_tests/gallery/open_image_files.js

@@ -161,29 +161,3 @@ testcase.openMultipleImagesOnDrive = function() {
 testcase.openMultipleImagesAndChangeToSlideModeOnDownloads = function() {
   return openMultipleImagesAndChangeToSlideMode('local', 'downloads');
 };
-
-/**
- * Runs a test to check whether the rename-input field is hidden after
- * deleting the only selected image in the gallery.
- * @return {Promise} Promise to be fulfilled with on success.
- */
-testcase.deleteSingleOpenPhotoOnDownloads = function() {
-  const launchedPromise = launch('local', 'downloads', [ENTRIES.desktop]);
-  return launchedPromise.then(function(args) {
-    const appId = args.appId;
-    return gallery.waitForElement(appId, 'button.delete')
-        .then(function() {
-          // Click the delete button.
-          return gallery.waitAndClickElement(appId, 'button.delete');
-        })
-        .then(function(result) {
-          chrome.test.assertTrue(!!result);
-          // Wait and click delete button of confirmation dialog.
-          return gallery.waitAndClickElement(appId, '.cr-dialog-ok');
-        })
-        .then(function() {
-          // Check: The edit name field should hide.
-          return gallery.waitForElement(appId, '#rename-input[hidden]');
-        });
-  });
-};
\ No newline at end of file

ui/file_manager/integration_tests/gallery/thumbnail_mode.js

@@ -118,9 +118,6 @@ function deleteAllImagesInThumbnailMode(testVolumeName, volumeType, operation) {
     chrome.test.assertTrue(!!result);
     // Wait until error banner is shown.
     return gallery.waitForElement(appId, '.gallery[error] .error-banner');
-  }).then(function() {
-    // Check: The edit name field should hide.
-    return gallery.waitForElement(appId, '#rename-input[hidden]');
   });
 }
 
@@ -163,9 +160,6 @@ function emptySpaceClickUnselectsInThumbnailMode(testVolumeName, volumeType) {
   }).then(function(result) {
     // Confirm slideshow button is disabled.
     return gallery.waitForElement(appId, 'button.slideshow[disabled]');
-  }).then(function() {
-    // Check: The edit name field should hide.
-    return gallery.waitForElement(appId, '#rename-input[hidden]');
   }).then(function() {
     // Switch back to slide mode by clicking mode button.
     return gallery.waitAndClickElement(appId, 'button.mode:not([disabled])');