Revert "fix(ast): add import generation for annotations on VariableExpr (#1076)"

This reverts commit 9e4721f.

Author: emmileaf

src/main/java/com/google/api/generator/engine/writer/ImportWriterVisitor.java

@@ -183,7 +183,6 @@ public void visit(TernaryExpr ternaryExpr) {
   @Override
   public void visit(VariableExpr variableExpr) {
     variableExpr.variable().type().accept(this);
-    annotations(variableExpr.annotations());
     if (variableExpr.exprReferenceExpr() != null) {
       variableExpr.exprReferenceExpr().accept(this);
     }

src/test/java/com/google/api/generator/engine/writer/ImportWriterVisitorTest.java

@@ -363,32 +363,6 @@ public void writeVariableExprImports_nestedReference() {
         writerVisitor.write());
   }
 
-  @Test
-  public void writeVariableExprImports_withAnnotations() {
-    Variable variable =
-        Variable.builder()
-            .setName("expr")
-            .setType(TypeNode.withReference(ConcreteReference.withClazz(Expr.class)))
-            .build();
-
-    VariableExpr variableExpr =
-        VariableExpr.builder()
-            .setVariable(variable)
-            .setIsDecl(true)
-            .setAnnotations(
-                Arrays.asList(
-                    AnnotationNode.withType(
-                        TypeNode.withReference(ConcreteReference.withClazz(Generated.class)))))
-            .build();
-
-    variableExpr.accept(writerVisitor);
-    assertEquals(
-        LineFormatter.lines(
-            "import com.google.api.generator.engine.ast.Expr;\n",
-            "import javax.annotation.Generated;\n\n"),
-        writerVisitor.write());
-  }
-
   @Test
   public void writeAnonymousClassExprImports() {
     // [Constructing] Function<List<IOException>, MethodDefinition>