Revert of Remove StringBuilder::appendLiteral.

third_party/WebKit/Source/core/css/MediaQuery.cpp

Index: third_party/WebKit/Source/core/css/MediaQuery.cpp
diff --git a/third_party/WebKit/Source/core/css/MediaQuery.cpp b/third_party/WebKit/Source/core/css/MediaQuery.cpp
index f440b1c1ced5ca7780bfc08086457829c985638d..4080e0a943832f249c0241a1f6a9616586287582 100644
--- a/third_party/WebKit/Source/core/css/MediaQuery.cpp
+++ b/third_party/WebKit/Source/core/css/MediaQuery.cpp
@@ -42,10 +42,10 @@
     StringBuilder result;
     switch (m_restrictor) {
     case MediaQuery::Only:
-        result.append("only ");
+        result.appendLiteral("only ");
         break;
     case MediaQuery::Not:
-        result.append("not ");
+        result.appendLiteral("not ");
         break;
     case MediaQuery::None:
         break;
@@ -58,12 +58,12 @@
 
     if (m_mediaType != MediaTypeNames::all || m_restrictor != None) {
         result.append(m_mediaType);
-        result.append(" and ");
+        result.appendLiteral(" and ");
     }
 
     result.append(m_expressions.at(0)->serialize());
     for (size_t i = 1; i < m_expressions.size(); ++i) {
-        result.append(" and ");
+        result.appendLiteral(" and ");
         result.append(m_expressions.at(i)->serialize());
     }
     return result.toString();