Remove inside_chromium_build gyp variable

webkit/media/webkit_media.gypi

Index: webkit/media/webkit_media.gypi
diff --git a/webkit/media/webkit_media.gypi b/webkit/media/webkit_media.gypi
index ce3ab1670c189c85cd57f6edb09b9bdc0cd277b6..4cbe8664a930bf7392d61416786e70d12da550e9 100644
--- a/webkit/media/webkit_media.gypi
+++ b/webkit/media/webkit_media.gypi
@@ -5,11 +5,6 @@
 {
   'variables': {
     'conditions': [
-      ['inside_chromium_build==0', {
-        'webkit_src_dir': '../../../../..',
-      },{
-        'webkit_src_dir': '../../third_party/WebKit',
-      }],
       ['OS == "android" or OS == "ios"', {
         # Android and iOS don't use ffmpeg.
         'use_ffmpeg%': 0,
@@ -39,9 +34,9 @@
         '<(DEPTH)/media/media.gyp:shared_memory_support',
         '<(DEPTH)/media/media.gyp:yuv_convert',
         '<(DEPTH)/skia/skia.gyp:skia',
+        '<(DEPTH)/third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
         '<(DEPTH)/third_party/widevine/cdm/widevine_cdm.gyp:widevine_cdm_version_h',
         '<(DEPTH)/webkit/compositor_bindings/compositor_bindings.gyp:webkit_compositor_bindings',
-        '<(webkit_src_dir)/Source/WebKit/chromium/WebKit.gyp:webkit',
       ],
       'sources': [
         'android/audio_decoder_android.cc',
@@ -97,11 +92,6 @@
         'websourcebuffer_impl.h',
       ],
       'conditions': [
-        ['inside_chromium_build == 0', {
-          'dependencies': [
-            '<(DEPTH)/webkit/support/setup_third_party.gyp:third_party_headers',
-          ],
-        }],
         ['OS == "android"', {
           'sources!': [
             'audio_decoder.cc',