Fix BUILD.gn to load the correct V8 snapshot configuration

BUG=pdfium:299
TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1520443002 .

(cherry picked from commit 94edf0c37d1ee6a03697375b9e227071ff2ee69d)

Review URL: https://codereview.chromium.org/1517653003 .
diff --git a/BUILD.gn b/BUILD.gn
index f72c3e4..df680c3 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
@@ -183,6 +184,7 @@
       "//v8",
       "//v8/include",
     ]
+    configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }
@@ -725,6 +727,7 @@
     public_deps = [
       "//v8",
     ]
+    configs += [ "//v8:external_startup_data" ]
   } else {
     sources += [ "fpdfsdk/src/javascript/JS_Runtime_Stub.cpp" ]
   }
@@ -1522,6 +1525,7 @@
       "//v8",
       "//v8/include",
     ]
+    configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }