Fix crash in content::BindTextSuggestionHostForFrame

This CL fixes the crash presumed to occur in
content::BindTextSuggestionHostForFrame since RFH::GetView could
return nullptr.

Bug: 1117491
Change-Id: I60293c661d7087083bf728862dfae9e0854daf79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2374325Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#801537}

content/browser/browser_interface_binders.cc

@@ -321,8 +321,7 @@ void BindTextSuggestionHostForFrame(
     content::RenderFrameHost* host,
     mojo::PendingReceiver<blink::mojom::TextSuggestionHost> receiver) {
   auto* view = static_cast<RenderWidgetHostViewAndroid*>(host->GetView());
-  DCHECK(view);
-  if (!view->text_suggestion_host())
+  if (!view || !view->text_suggestion_host())
     return;
 
   view->text_suggestion_host()->BindTextSuggestionHost(std::move(receiver));