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

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

Index: third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp b/third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp
index 9de792e16fe00fc1835b379c5e855c2e6f77904b..560cdf9049e3e82e25b1c3ec8cdf89104ace64f8 100644
--- a/third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -478,7 +478,7 @@ MutableStylePropertySet* CSSComputedStyleDeclaration::copyPropertiesInSet(
   for (unsigned i = 0; i < properties.size(); ++i) {
     const CSSValue* value = getPropertyCSSValue(properties[i]);
     if (value)
-      list.append(CSSProperty(properties[i], *value, false));
+      list.push_back(CSSProperty(properties[i], *value, false));
   }
   return MutableStylePropertySet::create(list.data(), list.size());
 }