Remove fa-file-text-o icon

- This removes the fa-file-text-o class from
the stylesheet and from mock data

app/assets/stylesheets/fontawesome_custom.scss

@@ -125,10 +125,6 @@
   content: '\f077';
 }
 
-.fa-file-text-o::before {
-  content: '\f0f6';
-}
-
 .fa-github::before {
   content: '\f09b';
 }

spec/frontend/diffs/components/diff_file_header_spec.js

@@ -20,7 +20,7 @@ const diffFile = Object.freeze(
       name: 'base.js',
       mode: '100644',
       readable_text: true,
-      icon: 'file-text-o',
+      icon: 'doc-text',
     },
   }),
 );

spec/frontend/diffs/mock_data/diff_discussions.js

@@ -260,7 +260,7 @@ export default {
       name: 'CHANGELOG',
       mode: '100644',
       readable_text: true,
-      icon: 'file-text-o',
+      icon: 'doc-text',
     },
     blob_path: 'CHANGELOG',
     blob_name: 'CHANGELOG',

spec/frontend/diffs/mock_data/diff_file.js

@@ -7,7 +7,7 @@ export default {
     name: 'CHANGELOG',
     mode: '100644',
     readable_text: true,
-    icon: 'file-text-o',
+    icon: 'doc-text',
   },
   blob_path: 'CHANGELOG',
   blob_name: 'CHANGELOG',

spec/frontend/diffs/mock_data/diff_file_unreadable.js

@@ -7,7 +7,7 @@ export default {
     name: 'CHANGELOG',
     mode: '100644',
     readable_text: false,
-    icon: 'file-text-o',
+    icon: 'doc-text',
   },
   blob_path: 'CHANGELOG',
   blob_name: 'CHANGELOG',