Fix google-explicit-constructor warnings.

Bug: 28341362
Change-Id: I9f388006f5593b9f224e98e93deca7da35c5618a
diff --git a/tests/binder/benchmarks/binderAddInts.cpp b/tests/binder/benchmarks/binderAddInts.cpp
index ff7ea07..f061f7c 100644
--- a/tests/binder/benchmarks/binderAddInts.cpp
+++ b/tests/binder/benchmarks/binderAddInts.cpp
@@ -73,7 +73,7 @@
 class AddIntsService : public BBinder
 {
   public:
-    AddIntsService(int cpu = unbound);
+    explicit AddIntsService(int cpu = unbound);
     virtual ~AddIntsService() {}
 
     enum command {
diff --git a/tests/fstest/recovery_test.cpp b/tests/fstest/recovery_test.cpp
index b93de83..02c7e8f 100644
--- a/tests/fstest/recovery_test.cpp
+++ b/tests/fstest/recovery_test.cpp
@@ -48,7 +48,7 @@
 
 class DataFileVerifier {
  public:
-  DataFileVerifier(const char* file_name) {
+  explicit DataFileVerifier(const char* file_name) {
     strncpy(test_file_, file_name, FILENAME_MAX);
   }