Revert of Depend on v8:v8 instead of v8:mksnapshot

Revert of Depend on v8:v8 instead of v8:mksnapshot (https://codereview.chromium.org/302783009/)

Reason for revert:
need to revert v8 roll

Original issue's description:
> Depend on v8:v8 instead of v8:mksnapshot
> 
> BUG=none
> R=brettw@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=274198

TBR=brettw@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=none

[jochen (gone - plz use gerrit), 2014-06-02 10:30:41]

Created Revert of Depend on v8:v8 instead of v8:mksnapshot

[commit-bot: I haz the power, 2014-06-02 10:31:08]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jochen@chromium.org/311433006/1

[commit-bot: I haz the power, 2014-06-02 10:32:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-02 10:32:29]

Failed to apply patch for BUILD.gn:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file BUILD.gn
  Hunk #1 FAILED at 78.
  1 out of 1 hunk FAILED -- saving rejects to file BUILD.gn.rej

Patch:       BUILD.gn
Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index
ef9390d8a3d7c7af468e64b1f8672af0845501de..3bb1f117e0af3546c6db54c3a814642fa81333b4
100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -78,7 +78,7 @@
     "//ui/strings",
     "//ui/surface",
     "//url",
-    "//v8:v8",
+    "//v8:mksnapshot",
   ]
 
   if (is_linux) {