Fix builds w/ component=="shared_library" and v8_use_external_startup_data==1.

test/cctest/cctest.gyp

Index: test/cctest/cctest.gyp
diff --git a/test/cctest/cctest.gyp b/test/cctest/cctest.gyp
index 6e00713e02d087f5c397fdf42ce4f988817a0eb6..9a39945b80e9e9faf24ec09802400bbf949346b1 100644
--- a/test/cctest/cctest.gyp
+++ b/test/cctest/cctest.gyp
@@ -259,13 +259,14 @@
           # cctest can't be built against a shared library, so we need to
           # depend on the underlying static target in that case.
           'conditions': [
-            ['v8_use_snapshot=="true"', {
+            ['v8_use_snapshot=="true" and v8_use_external_startup_data==0', {
               'dependencies': ['../../tools/gyp/v8.gyp:v8_snapshot'],
-            },
-            {
-              'dependencies': [
-                '../../tools/gyp/v8.gyp:v8_nosnapshot',
-              ],
+            }],
+            ['v8_use_snapshot=="true" and v8_use_external_startup_data==1', {
+              'dependencies': ['../../tools/gyp/v8.gyp:v8_external_snapshot'],
+            }],
+            ['v8_use_snapshot!="true"', {
+              'dependencies': ['../../tools/gyp/v8.gyp:v8_nosnapshot'],
             }],
           ],
         }, {