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ApplicationStatus ends up pulling in a *lot* of code, because it ends up
pulling in all of its listeners.

This reduces the main dex size by 3400 methods.

To get ApplicationStatus to not be included:
 * Made @MainDex applicable to methods
   * Changed ContextUtils and ChromeApplication to annotate methods
     rather than entire class.
 * Stopped using mainDexClasses.rules, in order to avoid -keep'ing all
   of ChromeApplication.attachBaseContext(). Really, all that's needed
   to be kept is the part of attachBaseContext() before the
   ChromiumMultiDexInstaller.install() call.

Bug: 820570
Change-Id: I39220b99f6d89b2429ba7406619a485179a3b2fc
Reviewed-on: https://chromium-review.googlesource.com/963307
Commit-Queue: agrieve <agrieve@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543831}