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/spdy_http_stream_unittest.cc b/net/spdy/spdy_http_stream_unittest.cc
index a6d4a12..8724853 100644
--- a/net/spdy/spdy_http_stream_unittest.cc
+++ b/net/spdy/spdy_http_stream_unittest.cc
@@ -8,7 +8,6 @@
 
 #include <memory>
 
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/stl_util.h"
 #include "crypto/ec_private_key.h"
@@ -100,7 +99,7 @@
 
   void TearDown() override {
     crypto::ECSignatureCreator::SetFactoryForTesting(NULL);
-    base::MessageLoop::current()->RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
     EXPECT_TRUE(sequenced_data_->AllReadDataConsumed());
     EXPECT_TRUE(sequenced_data_->AllWriteDataConsumed());
   }