Update DEPS for 4956 branching

Change-Id: Iebd027ce13e4cecc8400ca3404fd2bf86c4d6b13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3538889
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/4956@{#1}
Cr-Branched-From: 57bb6bd-refs/heads/main@{#983259}

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': '5398945f90f7de675c99bb33e7587744a610d0c3',
+  'v8_revision': 'refs/heads/chromium/4956',
   # 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': 'e56f185b3c476edad5f8cb02deed97c73b995f7a',
+  'angle_revision': 'refs/heads/chromium/4956',
   # 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': '2f3af2452783943f7d6994030a9fffa9ba3b3cec',
   # 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': 'c227ae53ba7c9e07da1186522cd705cef1ff4ea3',
+  'pdfium_revision': 'refs/heads/chromium/4956',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.
@@ -368,7 +368,7 @@ 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': 'd9d16bb657a1e1642ff21b1e05467fc919add046',
+  'dawn_revision': 'refs/heads/chromium/4956',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
@@ -1621,7 +1621,7 @@ 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',
   },
 
@@ -1692,7 +1692,7 @@ deps = {
   'src/third_party/usrsctp/usrsctplib':
     Var('chromium_git') + '/external/github.com/sctplab/usrsctp' + '@' + '62d7d0c928c9a040dce96aa2f16c00e7e67d59cb',
 
-  'src/third_party/vulkan-deps': '{chromium_git}/vulkan-deps@5fe1b21d6ba47a8dee59068d6927a4c157ec13a3',
+  'src/third_party/vulkan-deps': '{chromium_git}/vulkan-deps@refs/heads/chromium/4956',
 
   'src/third_party/vulkan_memory_allocator':
     Var('chromium_git') + '/external/github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator.git' + '@' + 'ebe84bec02c041d28f902da0214bf442743fc907',
@@ -1731,7 +1731,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '09f024e50e84f191ee4546ef4021707faa376096',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'f11a04d0f5399716b8782de083994bdc59190572',
+    Var('webrtc_git') + '/src.git' + '@' + 'refs/branch-heads/4956',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),
@@ -1801,7 +1801,7 @@ deps = {
     Var('chromium_git') + '/v8/v8.git' + '@' +  Var('v8_revision'),
 
   'src-internal': {
-    'url': 'https://chrome-internal.googlesource.com/chrome/src-internal.git@6328e10a7d6301d00e4019478e2065250733fe50',
+    'url': 'https://chrome-internal.googlesource.com/chrome/src-internal.git@refs/heads/chromium/4956',
     'condition': 'checkout_src_internal',
   },