Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/5c13474..68bf4b8

Rolling v8/third_party/fuchsia-sdk: https://chromium.googlesource.com/chromium/src/third_party/fuchsia-sdk/+log/1da4e38..74c827a

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: Ia676fa56d262206c40bcabfe479a3f74159a1eec
Reviewed-on: https://chromium-review.googlesource.com/1172077
Commit-Queue: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Reviewed-by: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#55072}

DEPS

@@ -13,7 +13,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '5c13474ef0ef140750035dbacb5c2512248a5dd9',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '68bf4b893087c4f85bff4c0a12effe306bfe2e08',
   'v8/tools/gyp':
     Var('chromium_url') + '/external/gyp.git' + '@' + 'd61a9397e668fa9843c4aa7da9e79460fe590bfb',
   'v8/third_party/depot_tools':
@@ -43,7 +43,7 @@ deps = {
     'condition': 'checkout_android',
   },
   'v8/third_party/fuchsia-sdk': {
-    'url': Var('chromium_url') + '/chromium/src/third_party/fuchsia-sdk.git' + '@' + '1da4e38049bc39d1ee1615dc57514af3d293532f',
+    'url': Var('chromium_url') + '/chromium/src/third_party/fuchsia-sdk.git' + '@' + '74c827aa187e06deb8e7c5179ce43157bd5254a3',
     'condition': 'checkout_fuchsia',
   },
   'v8/third_party/googletest/src':