Remove MessageLoop::current()->RunUntilIdle() in net.

This CL replaces MessageLoop::current()->RunUntilIdle() with
RunLoop().RunUntilIdle() in net.

In files where this replacement is made, it adds this include:
  #include "base/run_loop.h"
And removes this include if it is no longer required:
  #include "base/message_loop/message_loop.h"

Why?
- The fact that there's a MessageLoop on the thread is an
  unnecessary implementation detail. When browser threads
  are migrated to base/task_scheduler, tasks will no longer
  have access to a MessageLoop but they will be able to use
  RunLoop.
- MessageLoop::RunUntilIdle() is deprecated.

Steps to generate this patch:
1. Run message_loop_cleanup_3.py (see code on the bug).
2. Run tools/sort-headers.py on modified files.
3. Run git cl format.

BUG=616447
[email protected]

Review-Url: https://codereview.chromium.org/2053133002
Cr-Commit-Position: refs/heads/master@{#399197}
diff --git a/net/spdy/bidirectional_stream_spdy_impl_unittest.cc b/net/spdy/bidirectional_stream_spdy_impl_unittest.cc
index 7e56cfe..5940e625 100644
--- a/net/spdy/bidirectional_stream_spdy_impl_unittest.cc
+++ b/net/spdy/bidirectional_stream_spdy_impl_unittest.cc
@@ -360,7 +360,7 @@
 
   // Try to send data after Cancel(), should not get called back.
   delegate->SendData(buf.get(), buf->size(), false);
-  base::MessageLoop::current()->RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
   EXPECT_FALSE(delegate->on_failed_called());
 
   EXPECT_EQ("200", delegate->response_headers().find(":status")->second);