Replace WTF::emptyString{16Bit}() with a static global

third_party/WebKit/Source/core/layout/ng/ng_layout_inline_items_builder.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_layout_inline_items_builder.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_layout_inline_items_builder.cc b/third_party/WebKit/Source/core/layout/ng/ng_layout_inline_items_builder.cc
index 0a1ea0cc3a1038dd4ce3964e15cb76ab8e1bbddc..30334e0483c2fbe35d61cd0848cd6f873bf88096 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_layout_inline_items_builder.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_layout_inline_items_builder.cc
@@ -17,7 +17,7 @@ NGLayoutInlineItemsBuilder::~NGLayoutInlineItemsBuilder() {
 
 String NGLayoutInlineItemsBuilder::ToString() {
   if (has_pending_newline_)
-    ProcessPendingNewline(emptyString(), nullptr);
+    ProcessPendingNewline(emptyString, nullptr);
   return text_.toString();
 }
 
@@ -167,7 +167,7 @@ void NGLayoutInlineItemsBuilder::Append(UChar character,
   DCHECK(character != spaceCharacter && character != tabulationCharacter &&
          character != newlineCharacter && character != zeroWidthSpaceCharacter);
   if (has_pending_newline_)
-    ProcessPendingNewline(emptyString(), nullptr);
+    ProcessPendingNewline(emptyString, nullptr);
 
   text_.append(character);
   unsigned end_offset = text_.length();
@@ -178,7 +178,7 @@ void NGLayoutInlineItemsBuilder::Append(UChar character,
 void NGLayoutInlineItemsBuilder::AppendAsOpaqueToSpaceCollapsing(
     UChar character) {
   if (has_pending_newline_)
-    ProcessPendingNewline(emptyString(), nullptr);
+    ProcessPendingNewline(emptyString, nullptr);
 
   text_.append(character);
   unsigned end_offset = text_.length();