Stop renaming |at| method to maintain compatibility with STL algorithms.

tools/clang/rewrite_to_chrome_style/RewriteToChromeStyle.cpp

Index: tools/clang/rewrite_to_chrome_style/RewriteToChromeStyle.cpp
diff --git a/tools/clang/rewrite_to_chrome_style/RewriteToChromeStyle.cpp b/tools/clang/rewrite_to_chrome_style/RewriteToChromeStyle.cpp
index 4180e15a27c4d4efea9addd1660da62336e3fcb9..54f3da7866b704cf1333eff2be0568123045df7f 100644
--- a/tools/clang/rewrite_to_chrome_style/RewriteToChromeStyle.cpp
+++ b/tools/clang/rewrite_to_chrome_style/RewriteToChromeStyle.cpp
@@ -425,7 +425,7 @@ bool IsBlacklistedInstanceMethodName(llvm::StringRef name) {
 
       // https://crbug.com/672902: Should not rewrite names that mimick methods
       // from std library.
-      "back", "empty", "erase", "front", "insert", "length", "size",
+      "at", "back", "empty", "erase", "front", "insert", "length", "size",
   };
   for (const auto& b : kBlacklistedNames) {
     if (name == b)