WTF/std normalization: replace WTF::Vector::last with ::back

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp

Index: third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp b/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
index b049b8b2e8b8146bc4848ccae17c81678fd50a84..c0dbe2abde8735e9c052b093a1028ec244bdf7b2 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -523,7 +523,7 @@ size_t HTMLDocumentParser::processTokenizedChunkFromBackgroundParser(
       // To match main-thread parser behavior (which never checks
       // locationChangePending on the EOF path) we peek to see if this chunk has
       // an EOF and process it anyway.
-      if (tokens->last().type() == HTMLToken::EndOfFile) {
+      if (tokens->back().type() == HTMLToken::EndOfFile) {
         ASSERT(
             m_speculations
                 .isEmpty());  // There should never be any chunks after the EOF.