Remove the compile time flag for DATALIST Element.

Source/core/rendering/RenderThemeChromiumDefault.cpp

Index: Source/core/rendering/RenderThemeChromiumDefault.cpp
diff --git a/Source/core/rendering/RenderThemeChromiumDefault.cpp b/Source/core/rendering/RenderThemeChromiumDefault.cpp
index 267f189100b1f8fbe2819c3f44a947ac8774f4e2..17da6851e6de9e3102064d44d07aed9ef743d92b 100644
--- a/Source/core/rendering/RenderThemeChromiumDefault.cpp
+++ b/Source/core/rendering/RenderThemeChromiumDefault.cpp
@@ -26,6 +26,7 @@
 #include "core/rendering/RenderThemeChromiumDefault.h"
 
 #include "CSSValueKeywords.h"
+#include "RuntimeEnabledFeatures.h"
 #include "UserAgentStyleSheets.h"
 #include "core/platform/ScrollbarTheme.h"
 #include "core/platform/graphics/Color.h"
@@ -103,11 +104,15 @@ Color RenderThemeChromiumDefault::systemColor(int cssValueId) const
 
 String RenderThemeChromiumDefault::extraDefaultStyleSheet()
 {
+    static String datalistCss = (RuntimeEnabledFeatures::datalistEnabled()) ?

[tkent, 2013/05/20 21:32:11]

RenderThemeChromiumDefault is used only in Chromium Linux.
We should have this code in RenderTheme.cpp, and existing
extraDefaultStyleSheet() overrides should be like the following:

String RenderThemeChromiumXXX::extraDefaultStyleSheet()
{
    return RenderTheme::extraDefaultStyleSheet() + ....

+        "datalist {display: none ;}" : "";
 #if !OS(WINDOWS)
     return RenderThemeChromiumSkia::extraDefaultStyleSheet() +
-           String(themeChromiumLinuxUserAgentStyleSheet, sizeof(themeChromiumLinuxUserAgentStyleSheet));
+        String(themeChromiumLinuxUserAgentStyleSheet, sizeof(themeChromiumLinuxUserAgentStyleSheet)) +
+        datalistCss;
 #else
-    return RenderThemeChromiumSkia::extraDefaultStyleSheet();
+    return RenderThemeChromiumSkia::extraDefaultStyleSheet() +
+        datalistCss;
 #endif
 }
 
@@ -156,7 +161,6 @@ Color RenderThemeChromiumDefault::platformInactiveSelectionForegroundColor() con
     return m_inactiveSelectionForegroundColor;
 }
 
-#if ENABLE(DATALIST_ELEMENT)
 IntSize RenderThemeChromiumDefault::sliderTickSize() const
 {
     return IntSize(1, 6);
@@ -166,7 +170,6 @@ int RenderThemeChromiumDefault::sliderTickOffsetFromTrackCenter() const
 {
     return -16;
 }
-#endif
 
 void RenderThemeChromiumDefault::adjustSliderThumbSize(RenderStyle* style, Element* element) const
 {
@@ -337,9 +340,7 @@ bool RenderThemeChromiumDefault::paintSliderTrack(RenderObject* o, const PaintIn
     WebKit::WebCanvas* canvas = i.context->canvas();
     extraParams.slider.vertical = o->style()->appearance() == SliderVerticalPart;
 
-#if ENABLE(DATALIST_ELEMENT)
     paintSliderTicks(o, i, rect);
-#endif
 
     float zoomLevel = o->style()->effectiveZoom();
     GraphicsContextStateSaver stateSaver(*i.context);