cros: Remove unused low memory margin code from sandbox and zygote

content/browser/zygote_host/zygote_host_impl_linux.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_ZYGOTE_HOST_ZYGOTE_HOST_IMPL_LINUX_H_
 #define CONTENT_BROWSER_ZYGOTE_HOST_ZYGOTE_HOST_IMPL_LINUX_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 37 matching lines @@
   base::TerminationStatus GetTerminationStatus(base::ProcessHandle handle,
                                                bool known_dead,
                                                int* exit_code);
 
   // ZygoteHost implementation:
   virtual pid_t GetPid() const OVERRIDE;
   virtual pid_t GetSandboxHelperPid() const OVERRIDE;
   virtual int GetSandboxStatus() const OVERRIDE;
   virtual void AdjustRendererOOMScore(base::ProcessHandle process_handle,
                                       int score) OVERRIDE;
-  virtual void AdjustLowMemoryMargin(int64 margin_mb) OVERRIDE;
 
  private:
   friend struct DefaultSingletonTraits<ZygoteHostImpl>;
 
   ZygoteHostImpl();
   virtual ~ZygoteHostImpl();
 
   // Sends |data| to the zygote via |control_fd_|.  If |fds| is non-NULL, the
   // included file descriptors will also be passed.  The caller is responsible
   // for acquiring |control_lock_|.
@@ skipping 10 matching lines @@
   bool init_;
   bool using_suid_sandbox_;
   std::string sandbox_binary_;
   bool have_read_sandbox_status_word_;
   int sandbox_status_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ZYGOTE_HOST_ZYGOTE_HOST_IMPL_LINUX_H_