Update DEPS for 3966 branching

# This is an automated release commit.
# Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true
TBR=cmasso@chromium.org

Change-Id: Ie4f1f7379b16ac0e9d1b196875d3a0dd2495a879
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912893
Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/3966@{#1}
Cr-Branched-From: 71c035f-refs/heads/master@{#714552}

DEPS

@@ -172,23 +172,23 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.
-  'v8_revision': '5bd261c74a83c03dabaf9f269dad8b1c9a917038',
+  'v8_revision': 'refs/heads/chromium/3966',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.
   'swarming_revision': '885b3febcc170a60f25795304e60927b77d1e92d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.
-  'angle_revision': '3f647b1bf9a476adb1af5037b88ef7403eb73e31',
+  'angle_revision': 'refs/heads/chromium/3966',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.
   'swiftshader_revision': '197a5725f2fecd3368433a1fbfc8249480da8955',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.
-  'pdfium_revision': 'c85c137c5de6aed6db4914ca5375d100bd29d0c8',
+  'pdfium_revision': 'refs/heads/chromium/3966',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.
@@ -239,7 +239,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling devtools-frontend
   # and whatever else without interference from each other.
-  'devtools_frontend_revision': '0802bf500144bc9131e293f158115a9eaf346c50',
+  'devtools_frontend_revision': 'refs/heads/chromium/3966',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libprotobuf-mutator
   # and whatever else without interference from each other.
@@ -1551,7 +1551,7 @@ deps = {
     Var('chromium_git') + '/v8/v8.git' + '@' +  Var('v8_revision'),
 
   'src-internal': {
-    'url': 'https://chrome-internal.googlesource.com/chrome/src-internal.git@a9c64739fb43125f5f2771febdf5e9f62c79fcd1',
+    'url': 'https://chrome-internal.googlesource.com/chrome/src-internal.git@refs/heads/chromium/3966',
     'condition': 'checkout_src_internal',
   },