Disable ACTION_BOOT_COMPLETED event for 3rd party apps.

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 e73829160649581e024f99ab03965d8e25a9f65b..4f6a29cd8e38adf1296b35625f8d0c089620af2d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -86563,6 +86563,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-898005938" label="disable-pinch-virtual-viewport"/>
   <int value="-894214299" label="fill-on-account-select:enabled"/>
   <int value="-885601782" label="enable-contextual-search"/>
+  <int value="-876148583" label="ArcBootCompletedBroadcast:disabled"/>
   <int value="-867087281" label="enable-virtual-keyboard"/>
   <int value="-864266073" label="cros-regions-mode"/>
   <int value="-864205629" label="enable-offline-load-stale-cache"/>
@@ -86642,6 +86643,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-428599163" label="NTPDownloadSuggestions:enabled"/>
   <int value="-418868128" label="enable-experimental-web-platform-features"/>
   <int value="-396994784" label="enable-vr-shell"/>
+  <int value="-387606010" label="ArcBootCompletedBroadcast:enabled"/>
   <int value="-385337473" label="enable-fast-unload"/>
   <int value="-384589459" label="disable-supervised-user-safesites"/>
   <int value="-378180863" label="disable-panels"/>