Fix generation of target in Xcode project when using output_name.

tools/gn/xcode_writer.h

Index: tools/gn/xcode_writer.h
diff --git a/tools/gn/xcode_writer.h b/tools/gn/xcode_writer.h
index dd162c65f89695df89a468f2da70130989352b01..8c4e3040a0932af290c44a27b57cefa650a5c66f 100644
--- a/tools/gn/xcode_writer.h
+++ b/tools/gn/xcode_writer.h
@@ -22,6 +22,10 @@ class Target;
 using PBXAttributes = std::map<std::string, std::string>;
 class PBXProject;
 
+namespace base {
+class FilePath;
+}
+
 class XcodeWriter {
  public:
   enum TargetOsType {
@@ -69,6 +73,7 @@ class XcodeWriter {
                              const std::string& config_name,
                              const std::string& root_target,
                              const std::string& ninja_extra_args,
+                             const BuildSettings* build_settings,
                              TargetOsType target_os);
 
   // Generates the "sources.xcodeproj" project that reference all source