Migrate WTF::Vector::append() to ::push_back() [part 4 of N]

third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp

Index: third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp b/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
index f25b2d62a3acf2f810fa14384198e67424fd8dd2..3359f3306133a8370a5618e72e35bbbb8aa803e1 100644
--- a/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
@@ -53,7 +53,7 @@ void StyleSheetCollection::swapSheetsForSheetList(
 }
 
 void StyleSheetCollection::appendActiveStyleSheet(CSSStyleSheet* sheet) {
-  m_activeAuthorStyleSheets.append(sheet);
+  m_activeAuthorStyleSheets.push_back(sheet);
 }
 
 void StyleSheetCollection::appendActiveStyleSheets(
@@ -64,12 +64,12 @@ void StyleSheetCollection::appendActiveStyleSheets(
 void StyleSheetCollection::appendActiveStyleSheets(
     const HeapVector<TraceWrapperMember<CSSStyleSheet>>& sheets) {
   for (CSSStyleSheet* sheet : sheets) {
-    m_activeAuthorStyleSheets.append(sheet);
+    m_activeAuthorStyleSheets.push_back(sheet);
   }
 }
 
 void StyleSheetCollection::appendSheetForList(StyleSheet* sheet) {
-  m_styleSheetsForStyleSheetList.append(
+  m_styleSheetsForStyleSheetList.push_back(
       TraceWrapperMember<StyleSheet>(this, sheet));
 }