GN iOS build fixes.

tools/gn/gyp_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/gyp_binary_target_writer.h"
 
 #include <set>
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
@@ skipping 465 matching lines @@
     Indent(indent + kExtraIndent) << "'VALID_ARCHS': 'armv7 i386',\n";
 
     // Tell XCode to target both iPhone and iPad. GN has no such concept.
     Indent(indent + kExtraIndent) << "'TARGETED_DEVICE_FAMILY': '1,2',\n";
 
     if (IsIOSSimulator(flags.cflags)) {
       Indent(indent + kExtraIndent) << "'SDKROOT': 'iphonesimulator',\n";
     } else {
       Indent(indent + kExtraIndent) << "'SDKROOT': 'iphoneos',\n";
       std::string min_ver = GetIPhoneVersionMin(&flags.cflags);
-      if (!min_ver.empty())
-        Indent(indent + kExtraIndent) << "'IPHONEOS_DEPLOYMENT_TARGET': '',\n";
+      if (!min_ver.empty()) {
+        Indent(indent + kExtraIndent) << "'IPHONEOS_DEPLOYMENT_TARGET': '"
+                                      << min_ver << "',\n";
+      }
     }
   } else {
     // When doing regular Mac and "host" iOS (which look like regular Mac)
     // builds, we can set the ARCHS value to what's specified in the build.
     if (arch == "i386")
       Indent(indent + kExtraIndent) << "'ARCHS': [ 'i386' ],\n";
     else if (arch == "x86_64")
       Indent(indent + kExtraIndent) << "'ARCHS': [ 'x86_64' ],\n";
   }
 
@@ skipping 260 matching lines @@
     return;
 
   EscapeOptions options;
   options.mode = ESCAPE_JSON;
 
   Indent(indent) << "'" << name << "': [";
   WriteArrayValues(out_, values);
   out_ << " ],\n";
 }