Remove the remains of unused guards.

Source/core/features.gypi

Index: Source/core/features.gypi
diff --git a/Source/core/features.gypi b/Source/core/features.gypi
index 17450707306c65f26694b2e2086446d9ab29d769..b824ad50ea943183620499cb9109f912000600e8 100644
--- a/Source/core/features.gypi
+++ b/Source/core/features.gypi
@@ -37,7 +37,6 @@
       'ENABLE_CANVAS_USES_MAILBOX=0',
       'ENABLE_CHANNEL_MESSAGING=1',
       'ENABLE_CSS3_TEXT=0',
-      'ENABLE_CSS3_TEXT_LINE_BREAK=0',
       'ENABLE_CSS_COMPOSITING=0',
       'ENABLE_CSS_DEVICE_ADAPTATION=0',
       'ENABLE_CSS_EXCLUSIONS=1',
@@ -49,21 +48,16 @@
       'ENABLE_MATHML=0',
       'ENABLE_MEDIA_STREAM=<(enable_webrtc)',
       'ENABLE_RESOLUTION_MEDIA_QUERY=0',
-      'ENABLE_RUBY=1',
-      'ENABLE_SANDBOX=1',
       'ENABLE_SPEECH_SYNTHESIS=0',
       'ENABLE_SVG=<(enable_svg)',
       'ENABLE_SVG_FONTS=<(enable_svg)',
       'ENABLE_TOUCH_ICON_LOADING=<(enable_touch_icon_loading)',
-      'ENABLE_V8_SCRIPT_DEBUG_SERVER=1',
       'ENABLE_VIEWPORT=1',
       'ENABLE_WEBGL=1',
       'ENABLE_XHR_TIMEOUT=0',
-      'WTF_USE_BUILTIN_UTF8_CODEC=1',
       # WTF_USE_DYNAMIC_ANNOTATIONS=1 may be defined in build/common.gypi
       # We can't define it here because it should be present only
       # in Debug or release_valgrind_build=1 builds.
-      'WTF_USE_WEBKIT_IMAGE_DECODERS=1',
     ],
     # We have to nest variables inside variables so that they can be overridden
     # through GYP_DEFINES.