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

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: I3805211c70d2c2340afa4d6d956339d1b25751fc
Reviewed-on: https://chromium-review.googlesource.com/789728
Reviewed-by: Sergey Ulanov <[email protected]>
Commit-Queue: Chris Watkins <[email protected]>
Cr-Commit-Position: refs/heads/master@{#519543}
diff --git a/remoting/protocol/negotiating_host_authenticator.cc b/remoting/protocol/negotiating_host_authenticator.cc
index c7b098e..70c6e64f4 100644
--- a/remoting/protocol/negotiating_host_authenticator.cc
+++ b/remoting/protocol/negotiating_host_authenticator.cc
@@ -75,7 +75,7 @@
   return result;
 }
 
-NegotiatingHostAuthenticator::~NegotiatingHostAuthenticator() {}
+NegotiatingHostAuthenticator::~NegotiatingHostAuthenticator() = default;
 
 void NegotiatingHostAuthenticator::ProcessMessage(
     const buzz::XmlElement* message,