Bug 1206801 - fix broken CONFIG['DEBUG'] checks in moz.build files; r=mshal

These were supposed to be CONFIG['MOZ_DEBUG'].  webapprt doesn't use the
define it set up, however, so it was deleted rather than fixed.

webapprt/win/moz.build

@@ -14,8 +14,6 @@ SOURCES += [
 ]
 
 DEFINES['XPCOM_GLUE'] = True
-if CONFIG['DEBUG']:
-    DEFINES['DEBUG'] = True
 
 DEFINES['APP_VERSION'] = CONFIG['FIREFOX_VERSION']
 

widget/cocoa/moz.build

@@ -70,7 +70,7 @@ SOURCES += [
     'nsNativeThemeCocoa.mm',
 ]
 
-if not CONFIG['RELEASE_BUILD'] or CONFIG['DEBUG']:
+if not CONFIG['RELEASE_BUILD'] or CONFIG['MOZ_DEBUG']:
     SOURCES += [
         'nsSandboxViolationSink.mm',
     ]

xulrunner/app/moz.build

@@ -13,7 +13,7 @@ SOURCES += [
 ]
 
 DEFINES['XULRUNNER_PROGNAME'] = '"xulrunner"'
-if CONFIG['DEBUG']:
+if CONFIG['MOZ_DEBUG']:
     DEFINES['DEBUG'] = True
 
 LOCAL_INCLUDES += [