Android: Tweak Chrome's proguard flags (no-op)

chrome/android/java/proguard.flags

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# Fragments are loaded using reflection via Fragment.instantiate(Context,String)
-# This can be improved upon - see crbug.com/622023.
--keep public class com.google.android.apps.chrome** extends android.app.Fragment
--keep public class org.chromium** extends android.app.Fragment
+# Fragments loaded by name via Fragment.instantiate(Context,String)
+# Not all fragments in this package are PreferenceFragments. E.g. HomepageEditor
+# is a normal Fragment.
+-keep public class org.chromium.chrome.browser.preferences.** extends android.app.Fragment
 
 # These classes aren't themselves referenced, but __ProcessService[0,1,2...] are
 # referenced, and we look up these services by appending a number onto the name
 # of the base class. Thus, we need to keep the base class name around so that
 # the child classes can be looked up.
 -keep class org.chromium.content.app.SandboxedProcessService
 -keep class org.chromium.content.app.PrivilegedProcessService
 
 # SearchView is used in website_preferences_menu.xml and is constructed by
 # Android using reflection.
 -keep class android.support.v7.widget.SearchView {
   public <init>(...);
 }
 
-# The Google Play services library depends on the legacy Apache HTTP library,
-# and just adding it as proguard time dependency causes the following warnings:
-# `library class org.apache.http.params.HttpConnectionParams depends on program
-# class org.apache.http.params.HttpParams`. The library has its own
-# implementation of org.apache.http.params.HttpParams so it can safely be
-# ignored.
--dontwarn org.apache.http.params.HttpParams
-
 # This class member is referenced in BottomSheetBottomNav as a temporary
 # measure until the support library contains a solution for disabling shifting
 # mode. TODO(twellington): remove once support library has a fix and is rolled.
 -keepclassmembers class android.support.design.internal.BottomNavigationMenuView {
     boolean mShiftingMode;
 }