Remove the noop strictMissingRequires diagnostic group now that it unused.

PiperOrigin-RevId: 704857621

Author: concavelenz

src/com/google/javascript/jscomp/DiagnosticGroups.java

@@ -426,9 +426,6 @@ public static DiagnosticGroup forName(String name) {
           CheckMissingRequires.INDIRECT_NAMESPACE_REF_REQUIRE,
           CheckMissingRequires.INDIRECT_NAMESPACE_REF_REQUIRE_TYPE);
 
-  public static final DiagnosticGroup STRICT_MISSING_REQUIRE =
-      DiagnosticGroups.registerDeprecatedGroup("strictMissingRequire");
-
   /**
    * A set of diagnostics expected when parsing and type checking partial programs. Useful for clutz
    * (tool that extracts TypeScript definitions from JS code).

src/com/google/javascript/jscomp/J2clSuppressWarningsGuard.java

@@ -45,7 +45,6 @@ public final class J2clSuppressWarningsGuard extends WarningsGuard {
           DiagnosticGroups.LATE_PROVIDE,
           DiagnosticGroups.MISSING_OVERRIDE,
           DiagnosticGroups.MISSING_REQUIRE,
-          DiagnosticGroups.STRICT_MISSING_REQUIRE,
           DiagnosticGroups.STRICT_MODULE_DEP_CHECK,
           DiagnosticGroups.SUSPICIOUS_CODE,
           DiagnosticGroups.UNUSED_LOCAL_VARIABLE,

test/com/google/javascript/jscomp/CheckMissingRequiresTest.java

@@ -42,7 +42,6 @@ protected CompilerPass getProcessor(Compiler compiler) {
   protected CompilerOptions getOptions() {
     CompilerOptions options = super.getOptions();
     options.setWarningLevel(DiagnosticGroups.MISSING_REQUIRE, CheckLevel.WARNING);
-    options.setWarningLevel(DiagnosticGroups.STRICT_MISSING_REQUIRE, CheckLevel.WARNING);
     return options;
   }