Add an API around zygoteHost so that chrome doesn't reach into the internal content implementation.

chrome/browser/memory_details_linux.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/memory_details.h"
 
 #include <dirent.h>
 #include <fcntl.h>
 #include <unistd.h>
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_version_info.h"
 #include "base/process_util.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/url_constants.h"
-#include "content/browser/zygote_host_linux.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/zygote_host_linux.h"
 #include "content/public/common/process_type.h"
 #include "grit/chromium_strings.h"
 
 using content::BrowserThread;
 
 // Known browsers which we collect details for.
 enum BrowserType {
   CHROME = 0,
   FIREFOX,
   ICEWEASEL,
@@ skipping 199 matching lines @@
           }
         }
       }
 
       if (!found_parent)
         browsers_found.insert(i->pid);
     }
   }
 
   std::vector<pid_t> current_browser_processes;
-  const pid_t zygote = ZygoteHost::GetInstance()->pid();
+  const pid_t zygote = content::ZygoteHost::GetInstance()->GetPid();
   GetAllChildren(processes, getpid(), zygote, &current_browser_processes);
   ProcessData current_browser;
   GetProcessDataMemoryInformation(current_browser_processes, &current_browser);
   current_browser.name = WideToUTF16(chrome::kBrowserAppName);
   current_browser.process_name = ASCIIToUTF16("chrome");
 
   for (std::vector<ProcessMemoryInformation>::iterator
        i = current_browser.processes.begin();
        i != current_browser.processes.end(); ++i) {
     // Check if this is one of the child processes whose data we collected
@@ skipping 29 matching lines @@
     }
 
     process_data_.push_back(browser);
   }
 
   // Finally return to the browser thread.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&MemoryDetails::CollectChildInfoOnUIThread, this));
 }