Use ScopedTaskEnvironment instead of MessageLoop in /third_party/libaddressinput

MessageLoop will go away, eventually.

ScopedTaskEnvironment will per default start a ThreadPool, which should
be fine in most of the cases. If you belive your test needs to make sure
that no ThreadPool runs let me know and I will update the patch.

BUG=891670
This CL was uploaded by git cl split.

R=rouslan@chromium.org

Change-Id: I0d16e66a8b67117567d04884ebe7584fd7ea5926
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1649369
Auto-Submit: Carlos Caballero <carlscab@google.com>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Carlos Caballero <carlscab@google.com>
Cr-Commit-Position: refs/heads/master@{#667137}

third_party/libaddressinput/chromium/chrome_address_validator_unittest.cc

@@ -11,9 +11,9 @@
 #include <vector>
 
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/test/scoped_task_environment.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/libaddressinput/src/cpp/include/libaddressinput/address_data.h"
 #include "third_party/libaddressinput/src/cpp/include/libaddressinput/address_problem.h"
@@ -922,7 +922,7 @@ class FailingAddressValidatorTest : public testing::Test, LoadRulesListener {
     load_rules_success_ = success;
   }
 
-  base::MessageLoop ui_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
 
   DISALLOW_COPY_AND_ASSIGN(FailingAddressValidatorTest);
 };

third_party/libaddressinput/chromium/chrome_metadata_source_unittest.cc

@@ -4,8 +4,8 @@
 
 #include "third_party/libaddressinput/chromium/chrome_metadata_source.h"
 
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "mojo/core/embedder/embedder.h"
 #include "services/network/public/cpp/shared_url_loader_factory.h"
@@ -64,7 +64,7 @@ class ChromeMetadataSourceTest : public testing::Test {
     data_.reset(data);
   }
 
-  base::MessageLoop loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   network::TestURLLoaderFactory test_url_loader_factory_;
   scoped_refptr<network::SharedURLLoaderFactory> test_shared_loader_factory_;
   GURL url_;