AW: remove obsolete TODOs

No change to behavior, this only removes some old TODO comments
regarding upstreaming (which has obviously long-since happened).

Change-Id: I1b66ebf6f8f3b7080ec6716c57ed799cf04fc885
Reviewed-on: https://chromium-review.googlesource.com/877382Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530725}

android_webview/glue/java/src/com/android/webview/chromium/WebViewContentsClientAdapter.java

@@ -1281,7 +1281,6 @@ class WebViewContentsClientAdapter extends AwContentsClient {
         }
     }
 
-    // TODO: Move to upstream.
     private static class AwHttpAuthHandlerAdapter extends android.webkit.HttpAuthHandler {
         private AwHttpAuthHandler mAwHandler;
 
@@ -1314,7 +1313,6 @@ class WebViewContentsClientAdapter extends AwContentsClient {
 
     /**
      * Type adaptation class for PermissionRequest.
-     * TODO: Move to the upstream once the PermissionRequest is part of SDK.
      */
     public static class PermissionRequestAdapter extends PermissionRequest {