Bug 1382568: Avoid trying to resolve styles in an uninitialized presshell in GetInnerText. r=heycam

MozReview-Commit-ID: DFFb5OCQpHG

--HG--
extra : rebase_source : 2338719ce46efc405d845cc41ea633336c4e971c

dom/html/nsGenericHTMLElement.cpp

@@ -3060,7 +3060,10 @@ nsGenericHTMLElement::GetInnerText(mozilla::dom::DOMString& aValue,
 {
   if (!GetPrimaryFrame(FlushType::Layout)) {
     nsIPresShell* presShell = nsComputedDOMStyle::GetPresShellForContent(this);
-    if (!presShell || IsOrHasAncestorWithDisplayNone(this, presShell)) {
+    // NOTE(emilio): We need to check the presshell is styled in order to ensure
+    // the document is styled.
+    if (!presShell || !presShell->DidInitialize() ||
+        IsOrHasAncestorWithDisplayNone(this, presShell)) {
       GetTextContentInternal(aValue, aError);
       return;
     }