Assert CPDFSDK_Annot::GetPageView() never returns nullptr.

Then remove some dead code as a result.

Change-Id: I544c711b569a0f4a6ec59e69101e147c9cb3fac2
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/66376
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
diff --git a/fxjs/cjs_field.cpp b/fxjs/cjs_field.cpp
index 3e07a3a..1cd0d3f 100644
--- a/fxjs/cjs_field.cpp
+++ b/fxjs/cjs_field.cpp
@@ -1531,13 +1531,9 @@
       return CJS_Result::Failure(JSMessage::kBadObjectError);
 
     auto* pWidget = ToCPDFSDKWidget(pObserved.Get());
-    CPDFSDK_PageView* pPageView = pWidget->GetPageView();
-    if (!pPageView)
-      return CJS_Result::Failure(JSMessage::kBadObjectError);
-
     pRuntime->PutArrayElement(
         PageArray, i,
-        pRuntime->NewNumber(static_cast<int32_t>(pPageView->GetPageIndex())));
+        pRuntime->NewNumber(pWidget->GetPageView()->GetPageIndex()));
     ++i;
   }
   return CJS_Result::Success(PageArray);