Revert of Disallow posting tasks to SequencedWorkerPools by default.

content/renderer/render_thread_impl_browsertest.cc

Index: content/renderer/render_thread_impl_browsertest.cc
diff --git a/content/renderer/render_thread_impl_browsertest.cc b/content/renderer/render_thread_impl_browsertest.cc
index eec899e109cb7d0a8f6ea7c476365c6cac885a46..e5df94ac1ede01650e93e5e046746baa1b69d4ad 100644
--- a/content/renderer/render_thread_impl_browsertest.cc
+++ b/content/renderer/render_thread_impl_browsertest.cc
@@ -15,7 +15,6 @@
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
-#include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/output/buffer_to_texture_target_map.h"
 #include "content/app/mojo/mojo_init.h"
@@ -168,12 +167,6 @@
 class RenderThreadImplBrowserTest : public testing::Test {
  public:
   void SetUp() override {
-    // SequencedWorkerPool is enabled by default in tests. Disable it for this
-    // test to avoid a DCHECK failure when RenderThreadImpl::Init enables it.
-    // TODO(fdoray): Remove this once the SequencedWorkerPool to TaskScheduler
-    // redirection experiment concludes https://crbug.com/622400.
-    base::SequencedWorkerPool::DisableForProcessForTesting();
-
     content_renderer_client_.reset(new ContentRendererClient());
     SetRendererClientForTesting(content_renderer_client_.get());