Fix variable hiding warnings in Predicate classes

Change Id898e83534 made some member variables protected, which
causes warnings about hiding in derived classes which declare
variables of the same name.

Remove or rename the definitions in the derived classes.

Change-Id: I2b0dfaaf3739ea3154d5987637cc55ff162dd374

gerrit-server/src/main/java/com/google/gerrit/server/query/IntPredicate.java

@@ -16,25 +16,25 @@ package com.google.gerrit.server.query;
 
 /** Predicate to filter a field by matching integer value. */
 public abstract class IntPredicate<T> extends OperatorPredicate<T> {
-  private final int value;
+  private final int intValue;
 
   public IntPredicate(final String name, final String value) {
     super(name, value);
-    this.value = Integer.parseInt(value);
+    this.intValue = Integer.parseInt(value);
   }
 
-  public IntPredicate(final String name, final int value) {
-    super(name, String.valueOf(value));
-    this.value = value;
+  public IntPredicate(final String name, final int intValue) {
+    super(name, String.valueOf(intValue));
+    this.intValue = intValue;
   }
 
   public int intValue() {
-    return value;
+    return intValue;
   }
 
   @Override
   public int hashCode() {
-    return getOperator().hashCode() * 31 + value;
+    return getOperator().hashCode() * 31 + intValue;
   }
 
   @Override

gerrit-server/src/main/java/com/google/gerrit/server/query/change/EqualsFilePredicate.java

@@ -28,11 +28,8 @@ public class EqualsFilePredicate extends ChangeIndexPredicate {
     return Predicate.or(eqPath, new EqualsFilePredicate(value));
   }
 
-  protected final String value;
-
   private EqualsFilePredicate(String value) {
     super(ChangeField.FILE_PART, ChangeQueryBuilder.FIELD_FILE, value);
-    this.value = value;
   }
 
   @Override

gerrit-server/src/main/java/com/google/gerrit/server/query/change/EqualsPathPredicate.java

@@ -20,11 +20,8 @@ import java.util.Collections;
 import java.util.List;
 
 public class EqualsPathPredicate extends ChangeIndexPredicate {
-  protected final String value;
-
   public EqualsPathPredicate(String fieldName, String value) {
     super(ChangeField.PATH, fieldName, value);
-    this.value = value;
   }
 
   @Override