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Previously DevUI DFM Java files have locations that are inconsistent
with convention:
* Java files under .../modules/dev_ui/ should be in package
  org.chromium.chrome.features.dev_ui, but were instead placed in
  org.chromium.chrome.modules.dev_ui.
* /chrome/android/features/dev_ui/java should be
  /chrome/android/features/dev_ui/internal/java.

This CL fixes the above.

Change-Id: I523d040b0e1a2a041c2faa589d7606a04491ab1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2018248Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Fred Mello <fredmello@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735096}