Update the alignment of the chrome://apps theme attribution when theme is installed

chrome/browser/resources/ntp4/new_tab.css

Index: chrome/browser/resources/ntp4/new_tab.css
diff --git a/chrome/browser/resources/ntp4/new_tab.css b/chrome/browser/resources/ntp4/new_tab.css
index 79d0ddbbf790e9f43b1dcb640c61c0525680b15e..1be1e0c0577cad90d777003e4db472b16897d767 100644
--- a/chrome/browser/resources/ntp4/new_tab.css
+++ b/chrome/browser/resources/ntp4/new_tab.css
@@ -128,19 +128,13 @@ html[dir='rtl'] #notification-container {
 
 #attribution {
   bottom: 0;
-  left: auto;
   margin-left: 8px;
   /* Leave room for the scrollbar. */
   margin-right: 13px;
   position: absolute;
-  right: 0;
-  text-align: left;
   z-index: -5;
 }
 
-/* For themes that right-align their images, we flip the attribution to the
- * left to avoid conflicts. */
-html[themegravity='right'] #attribution,
 html[dir='rtl'] #attribution {
   left: 0;
   right: auto;