[TaskEnvironment] Remove done TODOs in header docs

TBR=dcheng@chromium.org

Bug: 992483
Change-Id: I20ab6c566d22994fd098a06e625aa9e7f1173e2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863752Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706193}

base/test/task_environment.h

@@ -33,7 +33,6 @@ class ScopedTimeClockOverrides;
 namespace test {
 
 // This header exposes SingleThreadTaskEnvironment and TaskEnvironment.
-// TODO(gab): Rename this header to task_environment.h and migrate all users.
 //
 // SingleThreadTaskEnvironment enables the following APIs within its scope:
 //  - (Thread|Sequenced)TaskRunnerHandle on the main thread

content/public/test/browser_task_environment.h

@@ -29,8 +29,6 @@ class TestBrowserThread;
 // - Same APIs as base::test::TaskEnvironment.
 // - content::BrowserThread.
 // - Public APIs of base::test::TaskEnvironment.
-// TODO(gab): Rename this header to browser_task_environment.h and migrate all
-// users.
 //
 // Only tests that need the BrowserThread API should instantiate a
 // BrowserTaskEnvironment. Use base::test::SingleThhreadTaskEnvironment or

ios/web/public/test/web_task_environment.h

@@ -7,9 +7,6 @@
 
 #include "base/test/task_environment.h"
 
-// TODO(crbug.com/992483): Rename this header to web_task_environment.h and
-// migrate all users.
-//
 // WebTaskEnvironment is the iOS equivalent of content::BrowserTaskEnvironment.
 //
 // It's is a convenience class for creating a set of TestWebThreads and a thread