Make task_manager_resource_providers.cc compile on POSIX.

base/process_util.h

Index: base/process_util.h
diff --git a/base/process_util.h b/base/process_util.h
index 9eb8690dc53fafab4facbfbe4431636e4729537b..8a2e87b20f9e7e2e2893f27aa3b3c8f5fb391021 100644
--- a/base/process_util.h
+++ b/base/process_util.h
@@ -71,6 +71,12 @@ ProcessHandle GetCurrentProcessHandle();
 // CloseProcessHandle when you are done with it. Returns true on success.
 bool OpenProcessHandle(ProcessId pid, ProcessHandle* handle);
 
+// Converts a PID to a process handle. On Windows the handle is opened
+// with more access rights and must only be used by trusted code.
+// You have to close returned handle using CloseProcessHandle. Returns true
+// on success.
+bool OpenPrivilegedProcessHandle(ProcessId pid, ProcessHandle* handle);
+
 // Closes the process handle opened by OpenProcessHandle.
 void CloseProcessHandle(ProcessHandle process);