Fix bookmarks metrics call.

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I1f2cddd7b8faade4c9913e08010ebe6be0dd12fe
Reviewed-on: https://chromium-review.googlesource.com/842709Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526767}

chrome/browser/resources/pdf/pdf.js

@@ -227,7 +227,7 @@ function PDFViewer(browserApi) {
   document.body.addEventListener('change-page', e => {
     this.viewport_.goToPage(e.detail.page);
     if (e.detail.origin == 'bookmark')
-      this.metrics.onBookmarkFollowed();
+      this.metrics.onFollowBookmark();
     else if (e.detail.origin == 'pageselector')
       this.metrics.onPageSelectorNavigation();
   });