Reland "Always build ChromeVox as compressed js"

This reverts commit 9871f52a.

Reason for revert: <INSERT REASONING HERE>
Was not the culprit of failing chromeos dbg SpokenFeedbackTests.


Original change's description:
> Revert "Always build ChromeVox as compressed js"
> 
> This reverts commit 725ceeda.
> 
> Reason for revert: Broke lots of tests on https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/linux-chromeos-dbg
> 
> chromevox test:
> BackgroundTest.NavigationEscapesEdit
> 
> interactive_ui_tests
> TestAsNormalAndGuestUser/SpokenFeedbackTest.OverviewMode/0
> TestAsNormalAndGuestUser/SpokenFeedbackTest.OverviewMode/1
> TestAsNormalAndGuestUser/SpokenFeedbackTest.OpenStatusTray/0
> TestAsNormalAndGuestUser/SpokenFeedbackTest.OpenStatusTray/1
> TestAsNormalAndGuestUser/SpokenFeedbackTest.ChromeVoxNextTabRecovery/0
> TestAsNormalAndGuestUser/SpokenFeedbackTest.ChromeVoxShiftSearch/0
> TestAsNormalAndGuestUser/SpokenFeedbackTest.FocusToolbar/1
> TestAsNormalAndGuestUser/SpokenFeedbackTest.ChromeVoxShiftSearch/1
> TestAsNormalAndGuestUser/SpokenFeedbackTest.ChromeVoxNextTabRecovery/1
> LoggedInSpokenFeedbackTest.KeyboardShortcutViewer
> TestAsNormalAndGuestUser/SpokenFeedbackTest.FocusToolbar/0
> TestAsNormalAndGuestUser/SpokenFeedbackTest.FocusShelf/0
> TestAsNormalAndGuestUser/SpokenFeedbackTest.FocusShelf/1
> GuestSpokenFeedbackTest.FocusToolbar
> 
> 
> Original change's description:
> > Always build ChromeVox as compressed js
> > 
> > ChromeVox can be run as both compressed (minified js) and uncompressed. The latter facilitates faster development.
> > 
> > It appears that in some instances, with the kevin board in particular, gn evaluates the ChromeVox build file incorrectly.
> > 
> > The end result is we end up with both uncompressed and compressed js files in ChromeVox leading to duplicate js objects.
> > 
> > Bug: 868579
> > Test: clean build for
> > 1. prior to this patch
> > 2. after this patch
> > 
> > Before each deployment, ensure we delete the chromevox folder on-device. This should be equilvanet to a new image.
> > 
> > Change-Id: I64cf826bda9239edc7764ba598bfed6dd0572d56
> > Reviewed-on: https://chromium-review.googlesource.com/1165787
> > Reviewed-by: Alex Newcomer <newcomer@chromium.org>
> > Commit-Queue: David Tseng <dtseng@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#581325}
> 
> TBR=dtseng@chromium.org,newcomer@chromium.org,oxyflush@google.com
> 
> Change-Id: Ifb3c2556f44b07161f491b18b49d556e364963fb
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 868579
> Reviewed-on: https://chromium-review.googlesource.com/1167442
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Commit-Queue: Avi Drissman <avi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#581564}

TBR=avi@chromium.org,dtseng@chromium.org,newcomer@chromium.org,oxyflush@google.com

Change-Id: Ifb1ec50fd3cbaa1e0b97a5b5cfdb7b3b9712b353
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 868579
Reviewed-on: https://chromium-review.googlesource.com/1167604Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581609}

chrome/browser/resources/chromeos/chromevox/BUILD.gn

@@ -14,7 +14,7 @@ assert(is_chromeos)
 declare_args() {
   # Whether to compress the main Chromevox javascript files or load the
   # modules individually from source files.
-  chromevox_compress_js = !is_debug
+  chromevox_compress_js = true
 }
 
 closure_library_dir =