Change base::Bind references is mojo documentation to Once/Repeating

TBR=sky@chromium.org

Bug: 714018
Change-Id: I02a0ee32e2b8113c205ed0353e0b4b330fd732de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1942871
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720025}

PRESUBMIT.py

@@ -401,7 +401,6 @@ _NOT_CONVERTED_TO_MODERN_BIND_AND_CALLBACK = '|'.join((
   '^media/remoting/',
   '^media/renderers/',
   '^media/test/',
-  '^mojo/public/',
   '^net/',
   '^ppapi/proxy/',
   '^ppapi/shared_impl/',

mojo/public/cpp/bindings/lib/multiplex_router.cc

@@ -903,7 +903,7 @@ void MultiplexRouter::MaybePostToProcessTasks(
 
 void MultiplexRouter::LockAndCallProcessTasks() {
   // There is no need to hold a ref to this class in this case because this is
-  // always called using base::Bind(), which holds a ref.
+  // always called from a bound callback, which holds a ref.
   MayAutoLock locker(&lock_);
   posted_to_process_tasks_ = false;
   scoped_refptr<base::SequencedTaskRunner> runner(

mojo/public/cpp/system/README.md

@@ -243,7 +243,8 @@ class PipeReader {
     // NOTE: base::Unretained is safe because the callback can never be run
     // after SimpleWatcher destruction.
     watcher_.Watch(pipe_.get(), MOJO_HANDLE_SIGNAL_READABLE,
-                   base::Bind(&PipeReader::OnReadable, base::Unretained(this)));
+                   base::BindRepeating(&PipeReader::OnReadable,
+				                       base::Unretained(this)));
   }
 
   ~PipeReader() {}