Revert of Update V8 DEPS. (patchset #1 id:1 of https://codereview.chromium.org/1179703005/)

Reason for revert:
[Sheriff] gyp change breaks calling gyp on XP:
http://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%201/builds/2849

Original issue's description:
> Update V8 DEPS.
>
> Rolling v8/build/gyp to fdcd8bc10c935eff13b391644b01460593c46861
>
> Rolling v8/tools/clang to 4cc9c6714533a07ba02ca01ed04557f055820532
>
> TBR=machenbach@chromium.org
>
> Committed: https://crrev.com/6e7e5e833c8bddf7d6a97cd3c01f0afe5a882bd6
> Cr-Commit-Position: refs/heads/master@{#29059}

TBR=v8-autoroll@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1180193003

Cr-Commit-Position: refs/heads/master@{#29060}

DEPS

@@ -8,7 +8,7 @@ vars = {
 
 deps = {
   "v8/build/gyp":
-    Var("git_url") + "/external/gyp.git" + "@" + "fdcd8bc10c935eff13b391644b01460593c46861",
+    Var("git_url") + "/external/gyp.git" + "@" + "79de4031069f37870f04e8b6bbf42f0c7fec37aa",
   "v8/third_party/icu":
     Var("git_url") + "/chromium/deps/icu.git" + "@" + "a05f412f70489b77da0ddeb8baa31c68e3eff2c6",
   "v8/buildtools":
@@ -18,7 +18,7 @@ deps = {
   "v8/testing/gmock":
     Var("git_url") + "/external/googlemock.git" + "@" + "29763965ab52f24565299976b936d1265cb6a271",  # from svn revision 501
   "v8/tools/clang":
-    Var("git_url") + "/chromium/src/tools/clang.git" + "@" + "4cc9c6714533a07ba02ca01ed04557f055820532",
+    Var("git_url") + "/chromium/src/tools/clang.git" + "@" + "66ba82eea5b4e2309c220cc3e0f2d67ebc3fff4c",
 }
 
 deps_os = {