Remove links from tab order in Print Preview

Bug: 1084957
Change-Id: Ida67162676737644e987a43aaff5cf713a75301e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212221Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#771318}

pdf/pdfium/pdfium_engine.cc

@@ -2707,7 +2707,8 @@ void PDFiumEngine::LoadForm() {
                                     kFormHighlightColor);
     FPDF_SetFormFieldHighlightAlpha(form(), kFormHighlightAlpha);
 
-    if (base::FeatureList::IsEnabled(features::kTabAcrossPDFAnnotations)) {
+    if (base::FeatureList::IsEnabled(features::kTabAcrossPDFAnnotations) &&
+        !client_->IsPrintPreview()) {
       static constexpr FPDF_ANNOTATION_SUBTYPE kFocusableAnnotSubtypes[] = {
           FPDF_ANNOT_LINK, FPDF_ANNOT_HIGHLIGHT, FPDF_ANNOT_WIDGET};
       FPDF_BOOL ret = FPDFAnnot_SetFocusableSubtypes(

pdf/preview_mode_client.cc

@@ -146,8 +146,7 @@ void PreviewModeClient::FormTextFieldFocusChange(bool in_focus) {
 }
 
 bool PreviewModeClient::IsPrintPreview() {
-  NOTREACHED();
-  return false;
+  return true;
 }
 
 float PreviewModeClient::GetToolbarHeightInScreenCoords() {