This is to address tedchoc's previous feedback.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc

commit f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc
Author: jianli <jianli@chromium.org>
Date: Tue Apr 25 22:35:47 2017

Move offline related functions from Tab to OfflinePageUtils

BUG= 715260 

Review-Url: https://codereview.chromium.org/2838773002
Cr-Commit-Position: refs/heads/master@{#467143}

[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageTabObserver.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarLayout.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/page_info/PageInfoPopup.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarModelImpl.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageRequestTest.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/OfflinePageTabObserverTest.java
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/browser/android/offline_pages/offline_page_bridge.cc
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/browser/android/offline_pages/offline_page_bridge.h
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/browser/android/tab_android.cc
[modify] https://crrev.com/f5fbad7f77e6e39ee8c5d3ec7516447b72128ddc/chrome/browser/android/tab_android.h