[Autofill] Add a separate enumeration for HTML field type hints.

chrome/test/data/autofill/heuristics/input/01_autocomplete_attribute_basic.html

Index: chrome/test/data/autofill/heuristics/input/01_autocomplete_attribute_basic.html
diff --git a/chrome/test/data/autofill/heuristics/input/01_autocomplete_attribute_basic.html b/chrome/test/data/autofill/heuristics/input/01_autocomplete_attribute_basic.html
index c2959b1050721a502b8641b55dfb4f8708e88fef..7974ee2873ea946f3a6dd7fed734d61519ba06c2 100644
--- a/chrome/test/data/autofill/heuristics/input/01_autocomplete_attribute_basic.html
+++ b/chrome/test/data/autofill/heuristics/input/01_autocomplete_attribute_basic.html
@@ -19,6 +19,7 @@
   <input id="al" autocomplete="locality"><br>
   <input id="ar" autocomplete="region"><br>
   <input id="ac" autocomplete="country"><br>
+  <input id="an" autocomplete="country-name"><br>
   <input id="ap" autocomplete="postal-code"><br>
   <input id="cn" autocomplete="cc-name"><br>
   <input id="cg" autocomplete="cc-given-name"><br>
@@ -27,9 +28,11 @@
   <input id="cc" autocomplete="cc-number"><br>
   <input id="ce" autocomplete="cc-exp"><br>
   <input id="c5" autocomplete="cc-exp" maxlength="5"><br>
+  <input id="c7" autocomplete="cc-exp" maxlength="7"><br>
   <input id="cm" autocomplete="cc-exp-month"><br>
   <input id="cy" autocomplete="cc-exp-year"><br>
   <input id="c2" autocomplete="cc-exp-year" maxlength="2"><br>
+  <input id="c4" autocomplete="cc-exp-year" maxlength="4"><br>
   <input id="cs" autocomplete="cc-csc"><br>
   <input id="ct" autocomplete="cc-type"><br>
   <input id="xl" autocomplete="language"><br>