Clang style plugin: remove 'warn-only' option

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 9b7793afe3b6380e49768743219c4b42ce2946c9..b0bc8d50dd6c3e2d140f3c4e7b86cc4a9c80a082 100644
--- a/tools/clang/plugins/ChromeClassTester.cpp
+++ b/tools/clang/plugins/ChromeClassTester.cpp
@@ -319,9 +319,6 @@ bool ChromeClassTester::GetFilename(SourceLocation loc,
 }
 
 DiagnosticsEngine::Level ChromeClassTester::getErrorLevel() {
-  if (options_.warn_only)
-    return DiagnosticsEngine::Warning;
-
   return diagnostic().getWarningsAsErrors() ? DiagnosticsEngine::Error
                                             : DiagnosticsEngine::Warning;
 }