DevTools: do not hide dialog on Esc with modifiers
DevTools: do not hide dialog on Esc with modifiers

Users expect pressing 'Escape' to hide dialogs in DevTools, except
when used with another modifier, e.g. 'Shift-Esc'.

Bug: 854548
Change-Id: I33f5052c44c70cacd2a4197161a502ac9c69fcee
Reviewed-on: https://chromium-review.googlesource.com/c/1366485
Reviewed-by: Andrey Lushnikov <73889f071ff743ad62763f13ff61c52ca3ee19d0@chromium.org>
Commit-Queue: Andrey Lushnikov <73889f071ff743ad62763f13ff61c52ca3ee19d0@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#615394}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: cb81f8aec78b746cef4a6fa91ebf3ab4b12ace73
ChromeDevTools/devtools-frontend,dart-archive/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,dart-archive/devtools-frontend,ChromeDevTools/devtools-frontend,dart-archive/devtools-frontend,dart-archive/devtools-frontend,dart-archive/devtools-frontend,ChromeDevTools/devtools-frontend,dart-archive/devtools-frontend