Add aria label to Presentation Start URL heading
Add aria label to Presentation Start URL heading

Bug: 1363819
Change-Id: Icc249dc206fc434509344a0f02c28bc5169b04d1
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3896933
Commit-Queue: Natasha Lee <c3c0f1160c8c02c0476887a86c99dbd3c6e658a5@microsoft.com>
Reviewed-by: Wolfgang Beyer <573aa99bb19da47d816981118f95c945310dd3f4@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend