roll gyp 1836:1840.

r1837: Support 'msvs_prebuild/msvs_postbuild' in MSBuild (VS 2010 and later)
r1838: win ninja: build fix for msvs_pre/postbuild error test
r1839: Fix VS 2008 generation with nested folders again
r1840: Strip the invalid characters from the string used as mspdbsrv endpoint

R=scottmg@chromium.org
BUG=335607

Review URL: https://codereview.chromium.org/141283007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245633 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -132,7 +132,7 @@ deps = {
     (Var("googlecode_url") % "grit-i18n") + "/trunk@147",
 
   "src/tools/gyp":
-    (Var("googlecode_url") % "gyp") + "/trunk@1836",
+    (Var("googlecode_url") % "gyp") + "/trunk@1840",
 
   "src/tools/swarming_client":
     Var("chromium_git") + "/external/swarming.client.git@" +