Remove dependency from NaCl code on chrome_constants.

chrome/browser/nacl_host/nacl_browser.cc

Index: chrome/browser/nacl_host/nacl_browser.cc
diff --git a/chrome/browser/nacl_host/nacl_browser.cc b/chrome/browser/nacl_host/nacl_browser.cc
index e6811d3134e41a62ac224806d605f6b776b35bd2..101a7de24b8d6b702b827e1230deee0b018d417a 100644
--- a/chrome/browser/nacl_host/nacl_browser.cc
+++ b/chrome/browser/nacl_host/nacl_browser.cc
@@ -197,6 +197,18 @@ void NaClBrowser::InitIrtFilePath() {
   }
 }
 
+#if defined(OS_WIN)
+bool NaClBrowser::GetNaCl64ExePath(base::FilePath* exe_path) {
+  base::FilePath module_path;
+  if (!PathService::Get(base::FILE_MODULE, &module_path)) {
+    LOG(ERROR) << "NaCl process launch failed: could not resolve module";
+    return false;
+  }
+  *exe_path = module_path.DirName().Append(L"nacl64");
+  return true;
+}
+#endif
+
 NaClBrowser* NaClBrowser::GetInstance() {
   return Singleton<NaClBrowser>::get();
 }