[TaskEnvironment] Remove old types

Explicitly (to document for git log purposes), this removes:
  - base::test::ScopedTaskEnvironment
  - net::WithScopedTaskEnvironment
  - net::TestWithScopedTaskEnvironment
  - content::TestBrowserThreadBundle
  - web::TestWebThreadBundle

Mass migrate stragglers which landed under old names after initial
mass migration.

[email protected]
(to bypass owners for mechanical changes outside //base)

Bug: 992483
Change-Id: I16cab3611b7f1a0a869f9f3af22d5b2952f91da6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1791271
Commit-Queue: Gabriel Charette <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Auto-Submit: Gabriel Charette <[email protected]>
Cr-Commit-Position: refs/heads/master@{#695003}
diff --git a/third_party/leveldatabase/env_chromium_unittest.cc b/third_party/leveldatabase/env_chromium_unittest.cc
index e5cd130..43b57cb 100644
--- a/third_party/leveldatabase/env_chromium_unittest.cc
+++ b/third_party/leveldatabase/env_chromium_unittest.cc
@@ -270,8 +270,7 @@
 class ChromiumEnvDBTrackerTest : public ::testing::Test {
  protected:
   ChromiumEnvDBTrackerTest()
-      : scoped_task_environment_(
-            base::test::ScopedTaskEnvironment::MainThreadType::UI) {}
+      : task_environment_(base::test::TaskEnvironment::MainThreadType::UI) {}
   void SetUp() override {
     testing::Test::SetUp();
     ASSERT_TRUE(scoped_temp_dir_.CreateUniqueTempDir());
@@ -306,7 +305,7 @@
 
  private:
   base::ScopedTempDir scoped_temp_dir_;
-  base::test::ScopedTaskEnvironment scoped_task_environment_;
+  base::test::TaskEnvironment task_environment_;
 };
 
 TEST_F(ChromiumEnvDBTrackerTest, OpenDatabase) {