[minijail] Update to new libchrome API

SConstruct

Index: SConstruct
diff --git a/SConstruct b/SConstruct
index dc32ec3eb26792c7b8e88315c5e6bda5edffbabf..d0f2d6d7fa2f4a8e619a2ab10f5b9a273abbbe0f 100644
--- a/SConstruct
+++ b/SConstruct
@@ -23,8 +23,10 @@ env.Append(
     CPPPATH=['..', '../../third_party/chrome/files', '../../common'],
     CCFLAGS=['-g'],
     LIBPATH=['../../third_party/chrome'],
-    LIBS=['cap', 'base', 'pthread', 'rt'],
+    LIBS=['cap', 'glib-2.0', 'base', 'pthread', 'rt'],
 )
+# glib-2.0 is only required by libbase
+
 for key in Split('CC CXX AR RANLIB LD NM CFLAGS CCFLAGS'):
   value = os.environ.get(key)
   if value != None:
@@ -32,10 +34,12 @@ for key in Split('CC CXX AR RANLIB LD NM CFLAGS CCFLAGS'):
 env['CCFLAGS'] += ['-fno-exceptions', '-Wall', '-Werror']
 
 # Fix issue with scons not passing some vars through the environment.
-for key in Split('PKG_CONFIG_LIBDIR PKG_CONFIG_PATH SYSROOT'):
+for key in Split('PKG_CONFIG SYSROOT'):
   if os.environ.has_key(key):
     env['ENV'][key] = os.environ[key]
 
+env.ParseConfig('%s --cflags --libs glib-2.0' % env['ENV']['PKG_CONFIG'])
+
 env_lib = env.Clone()
 env_lib.SharedLibrary('minijail', lib_sources)