win: Implement CrashpadClient::StartHandler()

test/win/child_launcher.h

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 24 matching lines @@
   ChildLauncher(const std::wstring& executable,
                 const std::wstring& command_line);
 
   ~ChildLauncher();
 
   //! \brief Starts the child process, after which the handle functions below
   //!     will be valid.
   void Start();
 
   //! \brief Waits for the child process to exit.
-  //! 
+  //!
   //! \return The process exit code.
   DWORD WaitForExit();
 
   //! \brief The child process's `HANDLE`.
   HANDLE process_handle() const { return process_handle_.get(); }
 
   //! \brief The child process's main thread's `HANDLE`.
   HANDLE main_thread_handle() const { return main_thread_handle_.get(); }
 
   //! \brief The read end of a pipe attached to the child's stdout.
   HANDLE stdout_read_handle() const { return stdout_read_handle_.get(); }
 
   //! \brief The write end of a pipe attached to the child's stdin.
   HANDLE stdin_write_handle() const { return stdin_write_handle_.get(); }
 
  private:
   std::wstring executable_;
   std::wstring command_line_;
   ScopedKernelHANDLE process_handle_;
   ScopedKernelHANDLE main_thread_handle_;
   ScopedFileHANDLE stdout_read_handle_;
   ScopedFileHANDLE stdin_write_handle_;
 };
 
-//! \brief Utility function for building escaped command lines.
-//!
-//! \param[in] argument Appended to \a command_line surrounded by properly
-//!     escaped quotation marks, if necessary.
-//! \param[inout] command_line The command line being constructed.
-void AppendCommandLineArgument(const std::wstring& argument,
-                               std::wstring* command_line);
-
 }  // namespace test
 }  // namespace crashpad
 
 #endif  // CRASHPAD_TEST_WIN_CHILD_LAUNCHER_H_