Migrate WTF::Vector::append() to ::push_back() [part 10 of N]

third_party/WebKit/Source/core/loader/resource/MultipartImageResourceParserTest.cpp

Index: third_party/WebKit/Source/core/loader/resource/MultipartImageResourceParserTest.cpp
diff --git a/third_party/WebKit/Source/core/loader/resource/MultipartImageResourceParserTest.cpp b/third_party/WebKit/Source/core/loader/resource/MultipartImageResourceParserTest.cpp
index f596ac34883a0a2722ccaf722983c991270c6336..7a3d4d552ce112d6b715fddd6bf2f6b8613940be 100644
--- a/third_party/WebKit/Source/core/loader/resource/MultipartImageResourceParserTest.cpp
+++ b/third_party/WebKit/Source/core/loader/resource/MultipartImageResourceParserTest.cpp
@@ -27,8 +27,8 @@ class MockClient final : public GarbageCollectedFinalized<MockClient>,
 
  public:
   void onePartInMultipartReceived(const ResourceResponse& response) override {
-    m_responses.append(response);
-    m_data.append(Vector<char>());
+    m_responses.push_back(response);
+    m_data.push_back(Vector<char>());
   }
   void multipartDataReceived(const char* bytes, size_t size) override {
     m_data.back().append(bytes, size);