Migrate WTF::Vector::append() to ::push_back() [part 3 of N]

third_party/WebKit/Source/core/css/cssom/CSSUnparsedValueTest.cpp

Index: third_party/WebKit/Source/core/css/cssom/CSSUnparsedValueTest.cpp
diff --git a/third_party/WebKit/Source/core/css/cssom/CSSUnparsedValueTest.cpp b/third_party/WebKit/Source/core/css/cssom/CSSUnparsedValueTest.cpp
index 94a24cf9f63b100f29c5355b38eb7a5609d75b75..33353df26693dae1c0247876c9a64653128adf24 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSUnparsedValueTest.cpp
+++ b/third_party/WebKit/Source/core/css/cssom/CSSUnparsedValueTest.cpp
@@ -14,7 +14,7 @@ namespace {
 CSSUnparsedValue* unparsedValueFromCSSVariableReferenceValue(
     CSSStyleVariableReferenceValue* variableReferenceValue) {
   HeapVector<StringOrCSSVariableReferenceValue> fragments;
-  fragments.append(
+  fragments.push_back(
       StringOrCSSVariableReferenceValue::fromCSSVariableReferenceValue(
           variableReferenceValue));
   return CSSUnparsedValue::create(fragments);
@@ -65,11 +65,11 @@ TEST(CSSUnparsedValueTest, MixedList) {
           "Ref", CSSUnparsedValue::fromString("string"));
 
   HeapVector<StringOrCSSVariableReferenceValue> fragments;
-  fragments.append(StringOrCSSVariableReferenceValue::fromString("string"));
-  fragments.append(
+  fragments.push_back(StringOrCSSVariableReferenceValue::fromString("string"));
+  fragments.push_back(
       StringOrCSSVariableReferenceValue::fromCSSVariableReferenceValue(
           variableReferenceValue));
-  fragments.append(StringOrCSSVariableReferenceValue());
+  fragments.push_back(StringOrCSSVariableReferenceValue());
 
   CSSUnparsedValue* unparsedValue = CSSUnparsedValue::create(fragments);