Migrate WTF::Vector::append() to ::push_back() [part 5 of N]

third_party/WebKit/Source/core/editing/state_machines/StateMachineTestUtil.cpp

Index: third_party/WebKit/Source/core/editing/state_machines/StateMachineTestUtil.cpp
diff --git a/third_party/WebKit/Source/core/editing/state_machines/StateMachineTestUtil.cpp b/third_party/WebKit/Source/core/editing/state_machines/StateMachineTestUtil.cpp
index 3118350c50b94694cadcd3ef3e1df33d17edacdc..4ba54f20e49a7b66968ef6e0ea87be045d9143d3 100644
--- a/third_party/WebKit/Source/core/editing/state_machines/StateMachineTestUtil.cpp
+++ b/third_party/WebKit/Source/core/editing/state_machines/StateMachineTestUtil.cpp
@@ -31,10 +31,10 @@ Vector<UChar> codePointsToCodeUnits(const Vector<UChar32>& codePoints) {
   Vector<UChar> out;
   for (const auto& codePoint : codePoints) {
     if (U16_LENGTH(codePoint) == 2) {
-      out.append(U16_LEAD(codePoint));
-      out.append(U16_TRAIL(codePoint));
+      out.push_back(U16_LEAD(codePoint));
+      out.push_back(U16_TRAIL(codePoint));
     } else {
-      out.append(static_cast<UChar>(codePoint));
+      out.push_back(static_cast<UChar>(codePoint));
     }
   }
   return out;