GN: Check if targets with precompiled headers use unsupported toolchains.

tools/gn/ninja_binary_target_writer.cc

Index: tools/gn/ninja_binary_target_writer.cc
diff --git a/tools/gn/ninja_binary_target_writer.cc b/tools/gn/ninja_binary_target_writer.cc
index da46149efa6b162180238c97d7414b8fdb06f9b5..ce1c4fc88ba336500501e0968dc17a891889a60c 100644
--- a/tools/gn/ninja_binary_target_writer.cc
+++ b/tools/gn/ninja_binary_target_writer.cc
@@ -26,25 +26,6 @@
 #include "tools/gn/substitution_writer.h"
 #include "tools/gn/target.h"
 
-// Represents a set of tool types. Must be first since it is also shared by
-// some helper functions in the anonymous namespace below.
-class NinjaBinaryTargetWriter::SourceFileTypeSet {
- public:
-  SourceFileTypeSet() {
-    memset(flags_, 0, sizeof(bool) * static_cast<int>(SOURCE_NUMTYPES));
-  }
-
-  void Set(SourceFileType type) {
-    flags_[static_cast<int>(type)] = true;
-  }
-  bool Get(SourceFileType type) const {
-    return flags_[static_cast<int>(type)];
-  }
-
- private:
-  bool flags_[static_cast<int>(SOURCE_NUMTYPES)];
-};
-
 namespace {
 
 // Returns the proper escape options for writing compiler and linker flags.
@@ -203,7 +184,7 @@ void GetPCHOutputFiles(const Target* target,
 void AddSourceSetObjectFiles(const Target* source_set,
                              UniqueVector<OutputFile>* obj_files) {
   std::vector<OutputFile> tool_outputs;  // Prevent allocation in loop.
-  NinjaBinaryTargetWriter::SourceFileTypeSet used_types;
+  SourceFileTypeSet used_types;
 
   // Compute object files for all sources. Only link the first output from
   // the tool if there are more than one.