[Browser/WebTaskEnvironment] Mass-migrate away from Test(Browser|Web)ThreadBundle

This is
 1) s/TestBrowserThreadBundle/BrowserTaskEnvironment/ on src/
 2) s/([^/])\b\w*thread_bundle(_)?/\1task_environment\2/ on files modified in (1)
 3) git cl format
 4) Manually fix up remainder "ThreadBundle" and "thread_bundle" found via
    string search on the whole of src/.

For ease of review:
 * Step #3 is the diff between patch sets 1..2
 * Step #4 is the diff between patch sets 2..3

[email protected]
(for post-review owners bypass per mechanical change)

Bug: 992483
Change-Id: I4945141f6d78bdc6c98444198e5012ddc8e5bff0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758440
Reviewed-by: Gabriel Charette <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Commit-Queue: Gabriel Charette <[email protected]>
Auto-Submit: Gabriel Charette <[email protected]>
Cr-Commit-Position: refs/heads/master@{#688755}
diff --git a/chrome/browser/extensions/extension_protocols_unittest.cc b/chrome/browser/extensions/extension_protocols_unittest.cc
index 0b5103e..295ae04 100644
--- a/chrome/browser/extensions/extension_protocols_unittest.cc
+++ b/chrome/browser/extensions/extension_protocols_unittest.cc
@@ -167,7 +167,7 @@
 class ExtensionProtocolsTestBase : public testing::Test {
  public:
   explicit ExtensionProtocolsTestBase(bool force_incognito)
-      : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
+      : task_environment_(content::BrowserTaskEnvironment::IO_MAINLOOP),
         rvh_test_enabler_(new content::RenderViewHostTestEnabler()),
         force_incognito_(force_incognito) {}
 
@@ -293,7 +293,7 @@
     return web_contents()->GetMainFrame();
   }
 
-  content::TestBrowserThreadBundle thread_bundle_;
+  content::BrowserTaskEnvironment task_environment_;
   std::unique_ptr<content::RenderViewHostTestEnabler> rvh_test_enabler_;
   std::unique_ptr<network::mojom::URLLoaderFactory> loader_factory_;
   std::unique_ptr<TestingProfile> testing_profile_;