clang: Fix a comment pointing to app_unittests instead of ui_unittests.

tools/clang/plugins/ChromeClassTester.cpp

Index: tools/clang/plugins/ChromeClassTester.cpp
diff --git a/tools/clang/plugins/ChromeClassTester.cpp b/tools/clang/plugins/ChromeClassTester.cpp
index 101877bfff60c0e51c9e4d19e2ebe80e19d89c59..303f31db1711a9a4eb6d54dd41b47267117d5707 100644
--- a/tools/clang/plugins/ChromeClassTester.cpp
+++ b/tools/clang/plugins/ChromeClassTester.cpp
@@ -127,7 +127,7 @@ void ChromeClassTester::BuildBannedLists() {
   // non-pod class member. Probably harmless.
   ignored_record_names_.insert("MockTransaction");
 
-  // Used heavily in app_unittests and once in views_unittests. Fixing this
+  // Used heavily in ui_unittests and once in views_unittests. Fixing this
   // isn't worth the overhead of an additional library.
   ignored_record_names_.insert("TestAnimationDelegate");