Quote flags in GN.

tools/gn/ninja_binary_target_writer.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/ninja_binary_target_writer.h"
 
 #include <stddef.h>
 #include <string.h>
 
 #include <cstring>
@@ skipping 33 matching lines @@
  private:
   bool flags_[static_cast<int>(SOURCE_NUMTYPES)];
 };
 
 namespace {
 
 // Returns the proper escape options for writing compiler and linker flags.
 EscapeOptions GetFlagOptions() {
   EscapeOptions opts;
   opts.mode = ESCAPE_NINJA_COMMAND;
-
-  // Some flag strings are actually multiple flags that expect to be just
-  // added to the command line. We assume that quoting is done by the
-  // buildfiles if it wants such things quoted.
-  opts.inhibit_quoting = true;
-
   return opts;
 }
 
 struct DefineWriter {
   DefineWriter() {
     options.mode = ESCAPE_NINJA_COMMAND;
   }
 
   void operator()(const std::string& s, std::ostream& out) const {
     out << " -D";
@@ skipping 928 matching lines @@
           "\n"
           "In the latter case, either rename one of the files or move one of\n"
           "the sources to a separate source_set to avoid them both being in\n"
           "the same target.");
       g_scheduler->FailWithError(err);
       return false;
     }
   }
   return true;
 }