Remove unused lambda capture

This is a preparation CL to remove -Wno-unused-lambda-capture warning suppression.

Bug: chromium:681136
Change-Id: I0fccfd33e10757b282b45079f29b511951decc41
Reviewed-on: https://pdfium-review.googlesource.com/c/44190
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/fpdfsdk/cpdfsdk_actionhandler.cpp b/fpdfsdk/cpdfsdk_actionhandler.cpp
index c9ef6bc..a3df789 100644
--- a/fpdfsdk/cpdfsdk_actionhandler.cpp
+++ b/fpdfsdk/cpdfsdk_actionhandler.cpp
@@ -296,7 +296,7 @@
   ASSERT(pFormFillEnv);
   if (action.GetType() == CPDF_Action::JavaScript) {
     RunScriptForAction(action, pFormFillEnv,
-                       [pFormFillEnv, pBookmark](IJS_EventContext* context) {
+                       [pBookmark](IJS_EventContext* context) {
                          context->OnBookmark_MouseUp(pBookmark);
                        });
   } else {