Use std::string instead of WebString in WebRuntimeFeatures

Source/web/WebRuntimeFeatures.cpp

Index: Source/web/WebRuntimeFeatures.cpp
diff --git a/Source/web/WebRuntimeFeatures.cpp b/Source/web/WebRuntimeFeatures.cpp
index 37d0ed0283a0f9ec3c5a8b0326196975d390c279..6653689deaaf557c223bc16b17fbe05605f83eb6 100644
--- a/Source/web/WebRuntimeFeatures.cpp
+++ b/Source/web/WebRuntimeFeatures.cpp
@@ -32,6 +32,7 @@
 #include "public/web/WebRuntimeFeatures.h"
 
 #include "platform/RuntimeEnabledFeatures.h"
+#include "wtf/Assertions.h"
 
 namespace blink {
 
@@ -45,11 +46,17 @@ void WebRuntimeFeatures::enableWebBluetooth(bool enable)
     RuntimeEnabledFeatures::setWebBluetoothEnabled(enable);
 }
 
-void WebRuntimeFeatures::enableFeatureFromString(const WebString& name, bool enable)
+void WebRuntimeFeatures::enableFeatureFromString(const std::string& name, bool enable)
 {
     RuntimeEnabledFeatures::setFeatureEnabledFromString(name, enable);
 }
 
+// TODO(bashi): Remove.
+void WebRuntimeFeatures::enableFeatureFromString(const WebString& name, bool enable)
+{
+    RuntimeEnabledFeatures::setFeatureEnabledFromString(name.latin1(), enable);
+}
+
 void WebRuntimeFeatures::enableBleedingEdgeFastPaths(bool enable)
 {
     ASSERT(enable);