Always leak the Mojo parent pipe handle on child process shutdown.

chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc

Index: chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc
diff --git a/chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc b/chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc
index 8368a79e2d1f507bf23a2907567137d7672983d3..e51dd4355882b08b6758bf4be30213a87bf65c76 100644
--- a/chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc
+++ b/chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc
@@ -448,10 +448,7 @@ IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest, ToURL) {
   ASSERT_TRUE(RunMediaGalleriesTestWithArg("tourl", custom_args)) << message_;
 }
 
-// The test failed continuosly on linux_ChromeOS. Disable it until the root
-// cause if fixed. crbug.com/618121.
-IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest,
-                       DISABLED_GetMetadata) {
+IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest, GetMetadata) {
   RemoveAllGalleries();
   MakeSingleFakeGallery(NULL);