debugd: Fix coding style and cpplint issues.

BUG=chromium:385849
TEST=`FEATURES=test emerge-$BOARD platform2`
TEST=`cpplint.py --root=src --filter=-build/include src/{*.h,*.cc,*/*.cc}`

Change-Id: Ia2475d6ee287dc727c3b2ffe139e9cc8bfe2e2e5
Reviewed-on: https://chromium-review.googlesource.com/204391
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/debugd/src/subprocess_tool.h b/debugd/src/subprocess_tool.h
index 898f02d..6b489f3 100644
--- a/debugd/src/subprocess_tool.h
+++ b/debugd/src/subprocess_tool.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef SUBPROCESS_TOOL_H
-#define SUBPROCESS_TOOL_H
+#ifndef SUBPROCESS_TOOL_H_
+#define SUBPROCESS_TOOL_H_
 
 #include <map>
 #include <string>
@@ -21,12 +21,14 @@
   virtual ~SubprocessTool();
 
   virtual ProcessWithId* CreateProcess(bool sandbox);
-  virtual void Stop(const std::string& handle, DBus::Error& error);
+  virtual void Stop(const std::string& handle, DBus::Error* error);
+
  private:
   std::map<std::string, ProcessWithId*> processes_;
+
   DISALLOW_COPY_AND_ASSIGN(SubprocessTool);
 };
 
-};  // namespace debugd
+}  // namespace debugd
 
-#endif  // SUBPROCESS_TOOL_H
+#endif  // SUBPROCESS_TOOL_H_