Replace base::NullableString16(bool) usage with default constructor.

webkit/common/webdropdata.cc

Index: webkit/common/webdropdata.cc
diff --git a/webkit/common/webdropdata.cc b/webkit/common/webdropdata.cc
index 0cc8b0f82e44a3affbfc3d3b78bde2db7c0e51dd..aee885ae828890a7ebae686d875d506b596c5e18 100644
--- a/webkit/common/webdropdata.cc
+++ b/webkit/common/webdropdata.cc
@@ -31,9 +31,7 @@ WebDropData::FileInfo::FileInfo(const base::string16& path,
 }
 
 WebDropData::WebDropData(const WebDragData& drag_data)
-    : referrer_policy(WebKit::WebReferrerPolicyDefault),
-      text(base::NullableString16(true)),
-      html(base::NullableString16(true)) {
+    : referrer_policy(WebKit::WebReferrerPolicyDefault) {
   const WebVector<WebDragData::Item>& item_list = drag_data.items();
   for (size_t i = 0; i < item_list.size(); ++i) {
     const WebDragData::Item& item = item_list[i];
@@ -75,9 +73,7 @@ WebDropData::WebDropData(const WebDragData& drag_data)
 }
 
 WebDropData::WebDropData()
-    : referrer_policy(WebKit::WebReferrerPolicyDefault),
-      text(base::NullableString16(true)),
-      html(base::NullableString16(true)) {
+    : referrer_policy(WebKit::WebReferrerPolicyDefault) {
 }
 
 WebDropData::~WebDropData() {