[M149] Don't use innerHTML on user controlled data

Original change's description:
> Don't use innerHTML on user controlled data
>
> The data is coming from untrusted source, so we should not
> render the HTML parts.
>
> Fixed: 513758833
> Change-Id: I5c2d755ab29bc75da09b420f3df695a6dc6a880c
> Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7856912
> Auto-Submit: Nikolay Vitkov <nvitkov@chromium.org>
> Commit-Queue: Nikolay Vitkov <nvitkov@chromium.org>
> Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>
> Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>

(cherry picked from commit 22f74fb)

Bug: 514928864,513758833
Change-Id: I5c2d755ab29bc75da09b420f3df695a6dc6a880c
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7868746
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: chrome-cherry-picker@chops-service-accounts.iam.gserviceaccount.com <chrome-cherry-picker@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>

Author: Lightning00Blade

front_end/ui/components/suggestion_input/SuggestionInput.ts

@@ -83,7 +83,7 @@ class EditableContent extends HTMLElement {
     this.tabIndex = 0;
 
     this.addEventListener('focus', () => {
-      this.innerHTML = this.innerText;
+      this.textContent = this.innerText;
     });
     this.addEventListener('blur', this.#highlight.bind(this));
   }