Enable Native CUPS printing on Chrome OS.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 18ec5e60d2720b284088f37d63fa53619511590e..36d95b08313655fb74ee00c8d9bdf5cef486b13d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -100665,7 +100665,6 @@ from previous Chrome versions.
   <int value="-548082154" label="protect-sync-credential:disabled"/>
   <int value="-541611402" label="OfflinePagesPrefetching:enabled"/>
   <int value="-536289234" label="ssl-interstitial-v2-colorful"/>
-  <int value="-535208779" label="enable-native-cups"/>

[Steven Holte, 2017/04/06 17:48:47]

You might actually want to leave this in, if it is still reported by old
clients.

[skau, 2017/04/06 18:02:40]

Thanks.  I'll remove it a few versions after we remove the flag.

   <int value="-531810064" label="saveas-menu-label"/>
   <int value="-528927088" label="AutofillCreditCardPopupLayout:disabled"/>
   <int value="-528149352" label="WebRtcUseEchoCanceller3:enabled"/>
@@ -100704,6 +100703,7 @@ from previous Chrome versions.
   <int value="-378180863" label="disable-panels"/>
   <int value="-378033324" label="disable-win32k-renderer-lockdown"/>
   <int value="-364325011" label="enable-files-quick-view"/>
+  <int value="-364267715" label="disable-native-cups"/>
   <int value="-362022976" label="disable-quirks-client"/>
   <int value="-361948582" label="material-security-verbose"/>
   <int value="-360038744" label="invert-viewport-scroll-order"/>