PDF: React to doc links on mouse up instead of mouse down.

pdf/pdfium/pdfium_engine.cc

Index: pdf/pdfium/pdfium_engine.cc
diff --git a/pdf/pdfium/pdfium_engine.cc b/pdf/pdfium/pdfium_engine.cc
index 8ab5a1bb67b2f5d879aeaf7561377195c36ad1c2..22a72c26330ff7d82ca2ce46ba938723fc4b279b 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -1706,19 +1706,13 @@ bool PDFiumEngine::OnMouseDown(const pp::MouseInputEvent& event) {
 
   // Decide whether to open link or not based on user action in mouse up and
   // mouse move events.
-  if (area == PDFiumPage::WEBLINK_AREA)
+  if (area == PDFiumPage::WEBLINK_AREA || area == PDFiumPage::DOCLINK_AREA)
     return true;
 
   // Prevent middle mouse button from selecting texts.
   if (event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_MIDDLE)
     return false;
 
-  if (area == PDFiumPage::DOCLINK_AREA) {
-    client_->ScrollToPage(target.page);
-    client_->FormTextFieldFocusChange(false);
-    return true;
-  }
-
   if (page_index != -1) {
     last_page_mouse_down_ = page_index;
     double page_x, page_y;
@@ -1816,6 +1810,11 @@ bool PDFiumEngine::OnMouseUp(const pp::MouseInputEvent& event) {
       client_->FormTextFieldFocusChange(false);
       return true;
     }
+    if (area == PDFiumPage::DOCLINK_AREA) {
+      client_->ScrollToPage(target.page);
+      client_->FormTextFieldFocusChange(false);
+      return true;
+    }
   }
 
   // Prevent middle mouse button from selecting texts.