Remove obsolete calls to SequenceTaskRunner.disableLifetimeCheck()

SequenceTaskRunner no longer require lifetime checks.

Bug: 877963
Change-Id: I6d779e47b4ded24f38f6a9c29aaddda102a13bbe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1602152Reviewed-by: Sam Maier <smaier@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658353}

android_webview/java/src/org/chromium/android_webview/AwBrowserProcess.java

@@ -62,12 +62,6 @@ public final class AwBrowserProcess {
     private static FileLock sExclusiveFileLock;
     private static String sWebViewPackageName;
 
-    // TODO(ksolt): This is a temporary solution to avoid lifetime check errors.
-    // Will be fixed after we decide how to handle the destruction of static TaskRunners.
-    static {
-        sSequencedTaskRunner.disableLifetimeCheck();
-    }
-
     /**
      * Loads the native library, and performs basic static construction of objects needed
      * to run webview in this process. Does not create threads; safe to call from zygote.

chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java

@@ -138,10 +138,6 @@ public class ShareServiceImpl implements ShareService {
     private static final TaskRunner TASK_RUNNER =
             PostTask.createSequencedTaskRunner(TaskTraits.USER_BLOCKING);
 
-    static {
-        TASK_RUNNER.disableLifetimeCheck();
-    }
-
     public ShareServiceImpl(@Nullable WebContents webContents) {
         mActivity = activityFromWebContents(webContents);
     }