Update DEPS for 4976 branching

Change-Id: Id5807391d576570ddf3da26b448244942f084da5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3563480
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/4976@{#1}
Cr-Branched-From: 845fb75-refs/heads/main@{#987411}

DEPS

@@ -257,19 +257,19 @@ 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': 'd57838b3298a4da7131359e3517611106616d046',
+  'v8_revision': 'refs/heads/chromium/4976',
   # 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': '5040c4d82bea40f12c4efd8cda3e628a310fb7e0',
+  'angle_revision': 'refs/heads/chromium/4976',
   # 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': 'bc5bec05c369fca4e336de513eb3630a5d326545',
   # 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': '23a5a5592b1db01627fd6ba24d1316903b37aed5',
+  'pdfium_revision': 'refs/heads/chromium/4976',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.
@@ -364,7 +364,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'dawn_revision': 'f57867264a7d661bb904df9f4404521f8e21f022',
+  'dawn_revision': 'refs/heads/chromium/4976',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
@@ -1626,7 +1626,7 @@ deps = {
   },
 
   'src/third_party/requests/src': {
-      'url': Var('chromium_git') + '/external/github.com/kennethreitz/requests.git' + '@' + 'refs/tags/v2.23.0',
+      'url': Var('chromium_git') + '/external/github.com/kennethreitz/requests.git' + '@' + 'c7e0fc087ceeadb8b4c84a0953a422c474093d6d',
       'condition': 'checkout_android',
   },
 
@@ -1697,7 +1697,7 @@ deps = {
   'src/third_party/usrsctp/usrsctplib':
     Var('chromium_git') + '/external/github.com/sctplab/usrsctp' + '@' + '62d7d0c928c9a040dce96aa2f16c00e7e67d59cb',
 
-  'src/third_party/vulkan-deps': '{chromium_git}/vulkan-deps@e37ba68c0fde1c26f6ea1fa5463b0919614f6c61',
+  'src/third_party/vulkan-deps': '{chromium_git}/vulkan-deps@refs/heads/chromium/4976',
 
   'src/third_party/vulkan_memory_allocator':
     Var('chromium_git') + '/external/github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator.git' + '@' + 'ebe84bec02c041d28f902da0214bf442743fc907',
@@ -1736,7 +1736,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '7afd2efc27572eda0e9b3a8c0831b47f5e6c3353',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '1e39da3092cb1c67e9b637161570c55a2f15ad45',
+    Var('webrtc_git') + '/src.git' + '@' + 'refs/branch-heads/4976',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),
@@ -1806,7 +1806,7 @@ deps = {
     Var('chromium_git') + '/v8/v8.git' + '@' +  Var('v8_revision'),
 
   'src-internal': {
-    'url': 'https://chrome-internal.googlesource.com/chrome/src-internal.git@3e1edf9d26bddcb13d62ff0be357e5927f014210',
+    'url': 'https://chrome-internal.googlesource.com/chrome/src-internal.git@refs/heads/chromium/4976',
     'condition': 'checkout_src_internal',
   },