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

R=machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/794213002

Cr-Commit-Position: refs/heads/master@{#25784}

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'],
             }],
           ],
         }, {

test/unittests/unittests.gyp

@@ -106,13 +106,14 @@
           # compiler-unittests 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'],
             }],
           ],
         }, {