Remove presubmit exception for base::Bind in //remoting/host

Bug: 1007823
Change-Id: Ia2aea90862946a5a6a8f95a9e5da76ed0241d876
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324207
Commit-Queue: Dirk Pranke <dpranke@google.com>
Auto-Submit: Evan Stade <estade@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#792401}

PRESUBMIT.py

@@ -398,7 +398,6 @@ _NOT_CONVERTED_TO_MODERN_BIND_AND_CALLBACK = '|'.join((
   '^net/http/',
   '^net/url_request/',
   '^ppapi/proxy/',
-  '^remoting/host/',
   '^services/',
   '^third_party/blink/',
   '^tools/clang/base_bind_rewriters/',  # Intentional.