minor SkSL changes to avoid compiler errors in Chromium

src/sksl/ir/SkSLSymbolTable.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSLSymbolTable.h"
 #include "SkSLUnresolvedFunction.h"
 
 namespace SkSL {
 
 std::vector<const FunctionDeclaration*> SymbolTable::GetFunctions(const Symbol& s) {
     switch (s.fKind) {
         case Symbol::kFunctionDeclaration_Kind:
             return { &((FunctionDeclaration&) s) };
         case Symbol::kUnresolvedFunction_Kind:
             return ((UnresolvedFunction&) s).fFunctions;
         default:
-            return { };
+            return std::vector<const FunctionDeclaration*>();
     }
 }
 
 const Symbol* SymbolTable::operator[](const std::string& name) {
     const auto& entry = fSymbols.find(name);
     if (entry == fSymbols.end()) {
         if (fParent) {
             return (*fParent)[name];
         }
         return nullptr;
@@ skipping 60 matching lines @@
             UnresolvedFunction* u = new UnresolvedFunction(std::move(functions));
             fSymbols[name] = u;
             this->takeOwnership(u);
         }
     } else {
         fErrorReporter.error(symbol->fPosition, "symbol '" + name + "' was already defined");
     }
 }
 
 } // namespace