content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/shell/renderer/test_runner/web_test_proxy.cc

Index: content/shell/renderer/test_runner/web_test_proxy.cc
diff --git a/content/shell/renderer/test_runner/web_test_proxy.cc b/content/shell/renderer/test_runner/web_test_proxy.cc
index 27abd2b2867627b8072093678f39a86ac527dd28..525cca83982e9edea9d3c37644f7986de1663ccf 100644
--- a/content/shell/renderer/test_runner/web_test_proxy.cc
+++ b/content/shell/renderer/test_runner/web_test_proxy.cc
@@ -8,10 +8,13 @@
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
+#include "base/location.h"
 #include "base/logging.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "content/shell/renderer/test_runner/accessibility_controller.h"
 #include "content/shell/renderer/test_runner/event_sender.h"
@@ -619,11 +622,9 @@ void WebTestProxyBase::CapturePixelsAsync(
   }
 
   if (test_interfaces_->GetTestRunner()->isPrinting()) {
-    base::MessageLoopProxy::current()->PostTask(
-        FROM_HERE,
-        base::Bind(&WebTestProxyBase::CapturePixelsForPrinting,
-                   base::Unretained(this),
-                   callback));
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE, base::Bind(&WebTestProxyBase::CapturePixelsForPrinting,
+                              base::Unretained(this), callback));
     return;
   }