Stop UIViewController swizzling by Firebase

Before this change, from debug console, you can see:
 - <AppMeasurement>[I-ACS036002] Analytics screen reporting is enabled...
This boolean option in Info.plist turns this off.

Bug: 989857
Change-Id: I83d1a22b9f546e2efb1278aaad7d66edb722fffd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729248
Auto-Submit: Peter Lee <pkl@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683219}

ios/chrome/app/resources/Info.plist

@@ -196,5 +196,7 @@
 	<string>IDS_IOS_BLUETOOTH_USAGE_DESCRIPTION</string>
 	<key>NSFaceIDUsageDescription</key>
 	<string>IDS_IOS_FACE_ID_USAGE_DESCRIPTION</string>
+	<key>FirebaseScreenReportingEnabled</key>
+	<false/>
 </dict>
 </plist>