Speculative revert to fix ChromeOS PFQ mips builder

build/linux/system.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
+    'conditions': [
+      ['sysroot!=""', {
+        'pkg-config': '<(chroot_cmd) ./pkg-config-wrapper "<(sysroot)" "<(target_arch)" "<(system_libdir)"',
+      }, {
+        'pkg-config': 'pkg-config',
+      }],
+    ],
+
     # If any of the linux_link_FOO below are set to 1, then the corresponding
     # target will be linked against the FOO library (either dynamically or
     # statically, depending on the pkg-config files), as opposed to loading the
     # FOO library dynamically with dlopen.
     'linux_link_libgps%': 0,
     'linux_link_libpci%': 0,
     'linux_link_libspeechd%': 0,
     'linux_link_libbrlapi%': 0,
 
     # Used below for the various libraries. In this scope for sharing with GN.
@@ skipping 1196 matching lines @@
                   },
                 }],
               ],
             }],
           ]
         }],
       ],
     },
   ],
 }