Bug 1428297 - (Part 3) Disable the assertion that don't allow to call ShowDropDown() in the content process when content-select is enabled. r=mats

To prevent the crash when content-select is enabled, I disable this
assertion that don't allow to call ShowDropDown() in the content
process.

MozReview-Commit-ID: F3BelChp1AK

--HG--
extra : rebase_source : 2bbec4dceffb7698804609010127b37442a907a7

layout/forms/nsComboboxControlFrame.cpp

@@ -943,7 +943,10 @@ nsComboboxControlFrame::GetFrameName(nsAString& aResult) const
 void
 nsComboboxControlFrame::ShowDropDown(bool aDoDropDown)
 {
-  MOZ_ASSERT(!XRE_IsContentProcess());
+  if (!nsLayoutUtils::IsContentSelectEnabled()) {
+    // TODO(kuoe0) remove this assertion after content-select is enabled
+    MOZ_ASSERT(!XRE_IsContentProcess());
+  }
   mDelayedShowDropDown = false;
   EventStates eventStates = mContent->AsElement()->State();
   if (aDoDropDown && eventStates.HasState(NS_EVENT_STATE_DISABLED)) {