vpn-manager: Update gyp files to use libchromeos from src/platform2

libchromeos was moved from src/platform to src/platform2. This CL updates
the gyp files to use the new location.

BUG=chromium:370258
TEST=FEATURES=test emerge-amd64-generic platform2
TEST=trybot run on daisy, link, mario and duck

CQ-DEPEND=CL:202334

Change-Id: I338e280e9e75c22c84617fa89d3c255de5150223
Reviewed-on: https://chromium-review.googlesource.com/202328
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
diff --git a/vpn-manager.gyp b/vpn-manager.gyp
index 659cd89..b4a4f4f 100644
--- a/vpn-manager.gyp
+++ b/vpn-manager.gyp
@@ -1,7 +1,7 @@
 {
   'target_defaults': {
     'dependencies': [
-      '../libchromeos/libchromeos-<(libbase_ver).gyp:libchromeos-<(libbase_ver)',
+      '../../platform2/libchromeos/libchromeos-<(libbase_ver).gyp:libchromeos-<(libbase_ver)',
     ],
     'variables': {
       'deps': [