Remove the compile time flag for DATALIST Element.

Source/core/css/html.css

Index: Source/core/css/html.css
diff --git a/Source/core/css/html.css b/Source/core/css/html.css
index 4eff1511240b813570297b3ad66738d25bad4618..219b7c7cb50dbf23032e4091925912db64b26f5a 100644
--- a/Source/core/css/html.css
+++ b/Source/core/css/html.css
@@ -488,11 +488,9 @@ input[type="search"]::-webkit-search-results-button {
     -webkit-user-modify: read-only !important;
 }
 
-#if defined(ENABLE_DATALIST_ELEMENT) && ENABLE_DATALIST_ELEMENT

[tkent, 2013/05/07 01:14:03]

It makes <datalist> display:none even if the runtime flags is off, and feature
detection in web sites will fail.  This rule should be added in
RenderTheme::extraDefaultStyleSheet depending on the runtime flag.

 datalist {
     display: none;
 }
-#endif
 
 #if defined(ENABLE_INPUT_MULTIPLE_FIELDS_UI) && ENABLE_INPUT_MULTIPLE_FIELDS_UI
 input[type="date"] {
@@ -888,8 +886,6 @@ input[type="color"]::-webkit-color-swatch {
     -webkit-user-modify: read-only !important;
 }
 
-#if defined(ENABLE_DATALIST_ELEMENT) && ENABLE_DATALIST_ELEMENT
-
 input[type="color"][list] {
     -webkit-appearance: menulist;
     width: 88px;
@@ -905,7 +901,6 @@ input[type="color"][list]::-webkit-color-swatch {
     border-color: #000000;
 }
 
-#endif // defined(ENABLE_DATALIST_ELEMENT) && ENABLE_DATALIST_ELEMENT
 
 #endif // defined(ENABLE_INPUT_TYPE_COLOR) && ENABLE_INPUT_TYPE_COLOR