Update third_party/devtools-frontend 8cfb8ccc1a..7789823ec9

https://chromium.googlesource.com/devtools/devtools-frontend/+log/8cfb8ccc1a..7789823ec9

TBR=yangguo@chromium.org

Change-Id: Ia6a3dd292950f61947c95f0ee6e78d226ade5312
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893883Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712113}

DEPS

@@ -243,7 +243,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling devtools-frontend
   # and whatever else without interference from each other.
-  'devtools_frontend_revision': '8cfb8ccc1ac82db1990dfadf7526081e46c2cb78',
+  'devtools_frontend_revision': '7789823ec9a7343649ba024a342075460e0bba4f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libprotobuf-mutator
   # and whatever else without interference from each other.