allow unit_tests to re-create service manager context.

content/browser/child_process_launcher_helper_android.cc

Index: content/browser/child_process_launcher_helper_android.cc
diff --git a/content/browser/child_process_launcher_helper_android.cc b/content/browser/child_process_launcher_helper_android.cc
index 955689e6cd060f535b87f2925795788b77b5d7fd..175fe9018cc2705f377670c322a8f11b738b10d0 100644
--- a/content/browser/child_process_launcher_helper_android.cc
+++ b/content/browser/child_process_launcher_helper_android.cc
@@ -170,6 +170,11 @@ void ChildProcessLauncherHelper::SetRegisteredFilesForService(
 }
 
 // static
+void ChildProcessLauncherHelper::ResetRegisteredFilesForTesting() {
+  ResetFilesToShareForTestingPosix();
+}
+
+// static
 base::File OpenFileToShare(const base::FilePath& path,
                            base::MemoryMappedFile::Region* region) {
   return base::File(base::android::OpenApkAsset(path.value(), region));