Standardize usage of virtual/override/final specifiers.

chrome/browser/search/iframe_source_unittest.cc

Index: chrome/browser/search/iframe_source_unittest.cc
diff --git a/chrome/browser/search/iframe_source_unittest.cc b/chrome/browser/search/iframe_source_unittest.cc
index 4adfe03adb9dfec046a441d896e3a1d624560b9d..728de4ce747c879b3566b6b8b5eb0d7910aaa2f3 100644
--- a/chrome/browser/search/iframe_source_unittest.cc
+++ b/chrome/browser/search/iframe_source_unittest.cc
@@ -126,7 +126,7 @@ class IframeSourceTest : public testing::Test {
   }
 
  private:
-  virtual void SetUp() override {
+  void SetUp() override {
     source_.reset(new TestIframeSource());
     callback_ = base::Bind(&IframeSourceTest::SaveResponse,
                            base::Unretained(this));
@@ -137,9 +137,7 @@ class IframeSourceTest : public testing::Test {
     response_ = NULL;
   }
 
-  virtual void TearDown() {
-    source_.reset();
-  }
+  void TearDown() override { source_.reset(); }
 
   void SaveResponse(base::RefCountedMemory* data) {
     response_ = data;