Add namespace and re-arrange PDFium's local copy of chromium /base.

third_party/base/template_util.h

Index: third_party/base/template_util.h
diff --git a/third_party/template_util.h b/third_party/base/template_util.h
similarity index 94%
rename from third_party/template_util.h
rename to third_party/base/template_util.h
index d4508dd6961326295f1c4b275c2180a3334b98c0..8d91379e5d32eba5f3cfaffbdf41bad804dce4bd 100644
--- a/third_party/template_util.h
+++ b/third_party/base/template_util.h
@@ -7,6 +7,7 @@
 
 #include <cstddef>  // For size_t.
 
+namespace third_party {
 namespace base {
 
 template<class T, T v>
@@ -29,5 +30,6 @@ template<class T>
 struct enable_if<true, T> { typedef T type; };
 
 }  // namespace base
+}  // namespace third_party
 
 #endif  // BASE_TEMPLATE_UTIL_H_