Remving global statics from the headers, so we can split-link.

content/common/child_process.h

Index: content/common/child_process.h
diff --git a/content/common/child_process.h b/content/common/child_process.h
index dc7df535c15b445c1a8126faddfa327533cbe1c6..7fd03b81ee3fccf57bfae1c9c795b2b4203802ed 100644
--- a/content/common/child_process.h
+++ b/content/common/child_process.h
@@ -54,7 +54,7 @@ class CONTENT_EXPORT ChildProcess {
   void ReleaseProcess();
 
   // Getter for the one ChildProcess object for this process.
-  static ChildProcess* current() { return child_process_; }
+  static ChildProcess* current();
 
   static void WaitForDebugger(const std::string& label);
  private:
@@ -71,9 +71,6 @@ class CONTENT_EXPORT ChildProcess {
   // io_thread_.
   scoped_ptr<ChildThread> main_thread_;
 
-  // The singleton instance for this process.
-  static ChildProcess* child_process_;
-
   DISALLOW_COPY_AND_ASSIGN(ChildProcess);
 };