Add missing (and remove superfluous) 'explicit' from constructors.

ipc/ipc_sync_channel_unittest.cc

Index: ipc/ipc_sync_channel_unittest.cc
diff --git a/ipc/ipc_sync_channel_unittest.cc b/ipc/ipc_sync_channel_unittest.cc
index c31565a63e247496ab721b354f9de12d9a7068b1..81834dca64397537bf8a08d01db72622d3ab492a 100644
--- a/ipc/ipc_sync_channel_unittest.cc
+++ b/ipc/ipc_sync_channel_unittest.cc
@@ -344,7 +344,7 @@ class TwoStepServer : public Worker {
 
 class TwoStepClient : public Worker {
  public:
-  TwoStepClient(bool create_pipe_now)
+  explicit TwoStepClient(bool create_pipe_now)
       : Worker(Channel::MODE_CLIENT, "simple_client"),
         create_pipe_now_(create_pipe_now) { }
 
@@ -1247,7 +1247,7 @@ class RestrictedDispatchServer : public Worker {
 
 class NonRestrictedDispatchServer : public Worker {
  public:
-  NonRestrictedDispatchServer(WaitableEvent* signal_event)
+  explicit NonRestrictedDispatchServer(WaitableEvent* signal_event)
       : Worker("non_restricted_channel", Channel::MODE_SERVER),
         signal_event_(signal_event) {}
 
@@ -1770,7 +1770,7 @@ namespace {
 
 class ReentrantReplyServer1 : public Worker {
  public:
-  ReentrantReplyServer1(WaitableEvent* server_ready)
+  explicit ReentrantReplyServer1(WaitableEvent* server_ready)
       : Worker("reentrant_reply1", Channel::MODE_SERVER),
         server_ready_(server_ready) { }
 
@@ -1844,7 +1844,7 @@ class ReentrantReplyServer2 : public Worker {
 
 class ReentrantReplyClient : public Worker {
  public:
-  ReentrantReplyClient(WaitableEvent* server_ready)
+  explicit ReentrantReplyClient(WaitableEvent* server_ready)
       : Worker("reentrant_reply1", Channel::MODE_CLIENT),
         server_ready_(server_ready) { }