Initialize V8 in PDFium from external files (in-renderer process only).

content/content_tests.gypi

Index: content/content_tests.gypi
diff --git a/content/content_tests.gypi b/content/content_tests.gypi
index 0e089bdbca6620a896b9a515f6e2d2fef3a88029..519f09e939248c1f0d709d6bfa57d8d3a2b8b16d 100644
--- a/content/content_tests.gypi
+++ b/content/content_tests.gypi
@@ -337,11 +337,15 @@
         }],
         ['OS=="android"', {
           'dependencies': [
-            '../gin/gin.gyp:gin',
             '../ui/shell_dialogs/shell_dialogs.gyp:shell_dialogs',
             'content.gyp:content_v8_external_data',
           ],
         }],
+        ['v8_use_external_startup_data==1', {
+          'dependencies': [
+            '../gin/gin.gyp:gin',
+          ],
+        }],
       ],
     },
     {