Explicitly whitelist 'blob:' and 'filesystem:' in extensions' default CSP.

chrome/common/extensions/manifest_tests/extension_manifests_sandboxed_unittest.cc

Index: chrome/common/extensions/manifest_tests/extension_manifests_sandboxed_unittest.cc
diff --git a/chrome/common/extensions/manifest_tests/extension_manifests_sandboxed_unittest.cc b/chrome/common/extensions/manifest_tests/extension_manifests_sandboxed_unittest.cc
index ad9e9b19f048c40ff6372b6e3d00861ce7bfb45e..f0771d428cd90de8f4b08a76b1949a87582c8f1b 100644
--- a/chrome/common/extensions/manifest_tests/extension_manifests_sandboxed_unittest.cc
+++ b/chrome/common/extensions/manifest_tests/extension_manifests_sandboxed_unittest.cc
@@ -37,7 +37,8 @@ TEST_F(SandboxedPagesManifestTest, SandboxedPages) {
 
   const char kSandboxedCSP[] = "sandbox allow-scripts allow-forms allow-popups";
   const char kDefaultCSP[] =
-      "script-src 'self' chrome-extension-resource:; object-src 'self';";
+      "script-src 'self' blob: filesystem: chrome-extension-resource:; "
+      "object-src 'self' blob: filesystem:;";
   const char kCustomSandboxedCSP[] =
       "sandbox; script-src: https://www.google.com";