Update URLs for deps/third_party/* in DEPS

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index be8dd5effe2bbccd431708c8116a634794fe77b0..d2d5e220e5c11a9e1c1152cacb29901efba8b18f 100644
--- a/DEPS
+++ b/DEPS
@@ -2,6 +2,7 @@
 
 vars = {
   'chromium_git': 'https://chromium.googlesource.com',
+  'webrtc_git': 'https://webrtc.googlesource.com',
   'chromium_revision': '946d80b37f66aa41b1826e64ad7bc60e6fda878a',
   'boringssl_git': 'https://boringssl.googlesource.com',
   # Three lines of non-changing comments so that
@@ -70,7 +71,7 @@ deps = {
   'src/third_party/openh264/src':
     Var('chromium_git') + '/external/github.com/cisco/openh264' + '@' + '0fd88df93c5dcaf858c57eb7892bd27763f0f0ac',
   'src/third_party/openmax_dl':
-    Var('chromium_git') + '/external/webrtc/deps/third_party/openmax.git' + '@' +  Var('openmax_dl_revision'),
+    Var('webrtc_git') + '/deps/third_party/openmax.git' + '@' +  Var('openmax_dl_revision'),
   'src/third_party/usrsctp/usrsctplib':
     Var('chromium_git') + '/external/github.com/sctplab/usrsctp' + '@' + 'f4819e1b177f7bfdd761c147f5a649b9f1a78c06',
   'src/third_party/yasm/source/patched-yasm':
@@ -83,7 +84,7 @@ deps = {
     Var('chromium_git') + '/infra/luci/client-py.git' + '@' +  Var('swarming_revision'),
   # WebRTC-only dependencies (not present in Chromium).
   'src/third_party/gflags':
-    Var('chromium_git') + '/external/webrtc/deps/third_party/gflags' + '@' + '892576179b45861b53e04a112996a738309cf364',
+    Var('webrtc_git') + '/deps/third_party/gflags' + '@' + '892576179b45861b53e04a112996a738309cf364',
   'src/third_party/gflags/src':
     Var('chromium_git') + '/external/github.com/gflags/gflags' + '@' + '03bebcb065c83beff83d50ae025a55a4bf94dfca',
   'src/third_party/gtest-parallel':
@@ -130,7 +131,7 @@ deps_os = {
       Var('chromium_git') + '/chromium/deps/yasm/binaries.git' + '@' + '52f9b3f4b0aa06da24ef8b123058bb61ee468881',
     # WebRTC-only dependency (not present in Chromium).
     'src/third_party/winsdk_samples':
-      Var('chromium_git') + '/external/webrtc/deps/third_party/winsdk_samples_v71' + '@' + '2d31a1cbecc86359e6ec041fb9ff6c082babd073',
+      Var('webrtc_git') + '/deps/third_party/winsdk_samples_v71' + '@' + '2d31a1cbecc86359e6ec041fb9ff6c082babd073',
   },
 }