Continuation of CL 5685007, rename the singleton accessor method in more files.

chrome/browser/child_process_launcher.cc

Index: chrome/browser/child_process_launcher.cc
diff --git a/chrome/browser/child_process_launcher.cc b/chrome/browser/child_process_launcher.cc
index 2586826acf8125ac4d8f6e9ddb8b4778f688e818..a4a610af8deb65ea628208c7922c0ccc57b8b016 100644
--- a/chrome/browser/child_process_launcher.cc
+++ b/chrome/browser/child_process_launcher.cc
@@ -173,7 +173,7 @@ class ChildProcessLauncher::Context
       // notification will be processed by the MachBroker after the call to
       // AddPlaceholderForPid(), enabling proper cleanup.
       {  // begin scope for AutoLock
-        MachBroker* broker = MachBroker::instance();
+        MachBroker* broker = MachBroker::GetInstance();
         AutoLock lock(broker->GetLock());
 
         // This call to |PrepareForFork()| will start the MachBroker listener