Unify PolicyBase into TargetPolicy.

content/common/sandbox_win.cc

Index: content/common/sandbox_win.cc
diff --git a/content/common/sandbox_win.cc b/content/common/sandbox_win.cc
index 5f0c5b246321243d11b1d0428128b374fdd8683a..2d35357aa38a833aff34a9fad0a794ac428cf166 100644
--- a/content/common/sandbox_win.cc
+++ b/content/common/sandbox_win.cc
@@ -35,7 +35,7 @@
 #include "sandbox/win/src/process_mitigations.h"
 #include "sandbox/win/src/sandbox.h"
 #include "sandbox/win/src/sandbox_nt_util.h"
-#include "sandbox/win/src/sandbox_policy_base.h"
+#include "sandbox/win/src/sandbox_policy.h"
 #include "sandbox/win/src/win_utils.h"
 #include "ui/gfx/win/direct_write.h"
 
@@ -802,11 +802,9 @@ base::Process StartSandboxedProcess(
     else if (result == sandbox::SBOX_ERROR_CREATE_PROCESS) {
       // TODO(shrikant): Remove this special case handling after determining
       // cause for lowbox/createprocess errors.
-      sandbox::PolicyBase* policy_base =
-          static_cast<sandbox::PolicyBase*>(policy);
-      UMA_HISTOGRAM_SPARSE_SLOWLY(policy_base->GetLowBoxSid() ?
-                                      "Process.Sandbox.Lowbox.Launch.Error" :
-                                      "Process.Sandbox.Launch.Error",
+      UMA_HISTOGRAM_SPARSE_SLOWLY(policy->GetLowBoxSid()
+                                      ? "Process.Sandbox.Lowbox.Launch.Error"

[cpu_(ooo_6.6-7.5), 2016/01/06 18:09:40]

can you please remove the UMA_HISTO call?  I don't think anybody cares or
monitors these.

+                                      : "Process.Sandbox.Launch.Error",
                                   last_error);
     } else
       DLOG(ERROR) << "Failed to launch process. Error: " << result;