[NTP] Remove special handling of solid color backgrounds

Now that image previews are supported this special
handling is no longer needed.

Bug: 854028
Change-Id: I51719b6dd7d53e3212034b2a9f69cc36db7518f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1661482Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669818}

chrome/browser/resources/local_ntp/customize.js

@@ -897,23 +897,13 @@ customize.showImageSelectionDialog = function(dialogTitle) {
   for (let i = 0; i < collImg.length; ++i) {
     const dataset = {};
 
-    // TODO(crbug.com/854028): Remove this hardcoded check when wallpaper
-    // previews are supported.
-    if (collImg[i].collectionId === 'solidcolors') {
-      dataset.attributionLine1 = '';
-      dataset.attributionLine2 = '';
-      dataset.attributionActionUrl = '';
-    } else {
-      dataset.attributionLine1 =
-          (collImg[i].attributions[0] !== undefined ?
-               collImg[i].attributions[0] :
-               '');
-      dataset.attributionLine2 =
-          (collImg[i].attributions[1] !== undefined ?
-               collImg[i].attributions[1] :
-               '');
-      dataset.attributionActionUrl = collImg[i].attributionActionUrl;
-    }
+    dataset.attributionLine1 =
+        (collImg[i].attributions[0] !== undefined ? collImg[i].attributions[0] :
+                                                    '');
+    dataset.attributionLine2 =
+        (collImg[i].attributions[1] !== undefined ? collImg[i].attributions[1] :
+                                                    '');
+    dataset.attributionActionUrl = collImg[i].attributionActionUrl;
     dataset.url = collImg[i].imageUrl;
     dataset.tileNum = i;
 
@@ -959,15 +949,8 @@ customize.showImageSelectionDialog = function(dialogTitle) {
  *     loading.
  */
 customize.loadTile = function(tile, imageData, countLoad) {
-  if (imageData[tile.dataset.tileNum].collectionId === 'solidcolors') {
-    tile.style.backgroundImage = [
-      customize.CUSTOM_BACKGROUND_OVERLAY,
-      'url(' + imageData[tile.dataset.tileNum].thumbnailImageUrl + ')'
-    ].join(',').trim();
-  } else {
-    tile.style.backgroundImage =
-        'url(' + imageData[tile.dataset.tileNum].thumbnailImageUrl + ')';
-  }
+  tile.style.backgroundImage =
+      'url(' + imageData[tile.dataset.tileNum].thumbnailImageUrl + ')';
   customize.fadeInImageTile(
       tile, imageData[tile.dataset.tileNum].thumbnailImageUrl, countLoad);
 };