Utils: Use override consistently

clang-tidy fixes from modernize-use-override check.

Change-Id: I89d27f359b6ee507153cb3712f61f81471ff0858
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/libs/utils/json.h

@@ -116,7 +116,7 @@ public:
         , m_value(value)
     {}
 
-    virtual JsonStringValue *toString() { return this; }
+    JsonStringValue *toString() override { return this; }
 
     const QString &value() const { return m_value; }
 
@@ -136,7 +136,7 @@ public:
         , m_value(value)
     {}
 
-    virtual JsonDoubleValue *toDouble() { return this; }
+    JsonDoubleValue *toDouble() override { return this; }
 
     double value() const { return m_value; }
 
@@ -155,7 +155,7 @@ public:
         , m_value(value)
     {}
 
-    virtual JsonIntValue *toInt() { return this; }
+    JsonIntValue *toInt() override { return this; }
 
     int value() const { return m_value; }
 
@@ -174,7 +174,7 @@ public:
         : JsonValue(Object)
     {}
 
-    virtual JsonObjectValue *toObject() { return this; }
+    JsonObjectValue *toObject() override { return this; }
 
     void addMember(const QString &name, JsonValue *value) { m_members.insert(name, value); }
     bool hasMember(const QString &name) const { return m_members.contains(name); }
@@ -202,7 +202,7 @@ public:
         : JsonValue(Array)
     {}
 
-    virtual JsonArrayValue *toArray() { return this; }
+    JsonArrayValue *toArray() override { return this; }
 
     void addElement(JsonValue *value) { m_elements.append(value); }
     QList<JsonValue *> elements() const { return m_elements; }
@@ -224,7 +224,7 @@ public:
         , m_value(value)
     {}
 
-    virtual JsonBooleanValue *toBoolean() { return this; }
+    JsonBooleanValue *toBoolean() override { return this; }
 
     bool value() const { return m_value; }
 
@@ -239,7 +239,7 @@ public:
         : JsonValue(Null)
     {}
 
-    virtual JsonNullValue *toNull() { return this; }
+    JsonNullValue *toNull() override { return this; }
 };
 
 class JsonSchemaManager;