Remove references to obsolete `AutoBuilderIsUnstable` option.

RELNOTES=n/a
PiperOrigin-RevId: 414827073
diff --git a/value/src/it/functional/pom.xml b/value/src/it/functional/pom.xml
index 8311389..18f3718 100644
--- a/value/src/it/functional/pom.xml
+++ b/value/src/it/functional/pom.xml
@@ -176,7 +176,6 @@
             <arg>-Xlint:all</arg>
             <arg>-encoding</arg>
             <arg>utf8</arg>
-            <arg>-Acom.google.auto.value.AutoBuilderIsUnstable</arg>
           </compilerArgs>
           <showWarnings>true</showWarnings>
           <showDeprecation>true</showDeprecation>
diff --git a/value/src/it/functional/src/test/java/com/google/auto/value/CompileWithEclipseTest.java b/value/src/it/functional/src/test/java/com/google/auto/value/CompileWithEclipseTest.java
index ca10fb4..5f08a72 100644
--- a/value/src/it/functional/src/test/java/com/google/auto/value/CompileWithEclipseTest.java
+++ b/value/src/it/functional/src/test/java/com/google/auto/value/CompileWithEclipseTest.java
@@ -127,8 +127,7 @@
             version,
             "-target",
             version,
-            "-warn:-warningToken,-intfAnnotation",
-            "-Acom.google.auto.value.AutoBuilderIsUnstable");
+            "-warn:-warningToken,-intfAnnotation");
     JavaCompiler.CompilationTask task =
         compiler.getTask(null, fileManager, null, options, null, sourceFileObjects);
     // Explicitly supply an empty list of extensions for AutoValueProcessor, because otherwise this