Revert "Make Lint FlaggedApi violations errors"

Revert submission 3156916-flagged-api-lint-baseline

Reason for revert: Droidmonitor created revert due to build breakages in b/350976857.

Reverted changes: /q/submissionid:3156916-flagged-api-lint-baseline

Change-Id: I625226c2d2a4b68094a6566d7a9459bd36d935c5
diff --git a/java/lint_defaults.txt b/java/lint_defaults.txt
index 262e184..b8ce95c 100644
--- a/java/lint_defaults.txt
+++ b/java/lint_defaults.txt
@@ -123,6 +123,9 @@
 --warning_check SupportAnnotationUsage
 --warning_check UniqueConstants
 --warning_check UseSdkSuppress
+# TODO(b/303434307) The intent is for this to be set to error severity
+# once existing violations are cleaned up
+--warning_check FlaggedApi
 
 --warning_check ExactAlarm
 --warning_check ExpiredTargetSdkVersion