Marking M55, RBS as per bug report.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4f5ce82e33afe872b6959dc381925666b14a413f

commit 4f5ce82e33afe872b6959dc381925666b14a413f
Author: dfalcantara <dfalcantara@chromium.org>
Date: Thu Sep 29 21:14:47 2016

[Download Home] Various M55 adjustments

* Replace "Open externally" with "Open with..." and force a chooser to
  appear when there's more than one possibility for an app, even if the
  user has a default set.

* Replace file size display with logical size values that are smaller
  than GB

* Replace X with <-

BUG= 650451 , 650447 , 643795 

Review-Url: https://codereview.chromium.org/2359763003
Cr-Commit-Position: refs/heads/master@{#421933}

[modify] https://crrev.com/4f5ce82e33afe872b6959dc381925666b14a413f/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabIntentDataProvider.java
[modify] https://crrev.com/4f5ce82e33afe872b6959dc381925666b14a413f/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
[modify] https://crrev.com/4f5ce82e33afe872b6959dc381925666b14a413f/chrome/android/java/src/org/chromium/chrome/browser/download/ui/DownloadHistoryItemWrapper.java
[modify] https://crrev.com/4f5ce82e33afe872b6959dc381925666b14a413f/chrome/android/java/src/org/chromium/chrome/browser/download/ui/SpaceDisplay.java
[modify] https://crrev.com/4f5ce82e33afe872b6959dc381925666b14a413f/chrome/android/java/strings/android_chrome_strings.grd
[modify] https://crrev.com/4f5ce82e33afe872b6959dc381925666b14a413f/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadActivityTest.java

Verified in M55 - 55.0.2880.3 build

[Auto-generated comment by a script] We noticed that this issue is targeted for M-55; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-55 label, otherwise remove Merge-TBD label. Thanks.

Just when I thought the erroneous Merge-Merged-2840 merge bot was annoying enough, a wild blockerbot with erroneous merge requests appears.