Use webrtc_root instead of DEPTH for iSAC.

Un-breaks chromium.webrtc.fyi. Broken as Chromium doesn't have webrtc/
checked out in root.

TBR=bjornv@webrtc.org,tommi@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/28289004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7897 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_processing/audio_processing.gypi b/webrtc/modules/audio_processing/audio_processing.gypi
index 74398f2..a51cf2e 100644
--- a/webrtc/modules/audio_processing/audio_processing.gypi
+++ b/webrtc/modules/audio_processing/audio_processing.gypi
@@ -9,9 +9,9 @@
 {
   'variables': {
     'audio_processing_dependencies': [
-      '<(DEPTH)/webrtc/modules/modules.gyp:iSAC',
       '<(webrtc_root)/base/base.gyp:rtc_base_approved',
       '<(webrtc_root)/common_audio/common_audio.gyp:common_audio',
+      '<(webrtc_root)/modules/modules.gyp:iSAC',
       '<(webrtc_root)/system_wrappers/source/system_wrappers.gyp:system_wrappers',
     ],
     'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/audio_processing/asm_offsets',