Run clang-tidy modernize-use-equals-{delete,default} on //apps

See the bugs and cxx post for justification and details:
https://groups.google.com/a/chromium.org/forum/#!topic/cxx/RkOHzIK6Tq8

This change was done using clang-tidy as described here:
https://chromium.googlesource.com/chromium/src/+/lkcr/docs/clang_tidy.md

In some cases the the tool leaves behind a string of commas where it
replaced a member initializer list
(https://bugs.llvm.org/show_bug.cgi?id=35051). They were cleaned up with:
  git diff --name-only | \
    xargs sed -E -i 's/(^\s*|\)\s*):[ ,]*= default/\1 = default/'

BUG=778959,778957

Change-Id: I0085476ed1fd901c9de97c91d2e12cc1d3faa1af
Reviewed-on: https://chromium-review.googlesource.com/789738
Commit-Queue: Chris Watkins <watk@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519211}

• apps/app_lifetime_monitor.cc[diff]
• apps/app_lifetime_monitor_factory.cc[diff]
• apps/app_restore_service_factory.cc[diff]
• apps/launcher.cc[diff]
• apps/saved_files_service.cc[diff]
• apps/saved_files_service_factory.cc[diff]
• apps/ui/views/app_window_frame_view.cc[diff]