Revert "fix google3?"

This reverts commit ccb8e8bf38f51e35e0a456c6a724bab96d1b657a.

Reason for revert: rolling back a CL this attempted to fix.

Original change's description:
> fix google3?
> 
> TBR=brianosman@google.com
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4822
> 
> Change-Id: I991232e90c6851938151daa59cdeb4a3e22a7f03
> Reviewed-on: https://skia-review.googlesource.com/4822
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Brian Osman <brianosman@google.com>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
> 

TBR=mtklein@chromium.org,brianosman@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I127165f065be45af98528c8ae825e2f0fe5c8b0d
Reviewed-on: https://skia-review.googlesource.com/4828
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/src/core/SkFixedAlloc.h b/src/core/SkFixedAlloc.h
index 504783c..0f45057 100644
--- a/src/core/SkFixedAlloc.h
+++ b/src/core/SkFixedAlloc.h
@@ -15,16 +15,13 @@
 #include <utility>
 #include <vector>
 
-namespace {
-    // Before GCC 5, is_trivially_copyable had a pre-standard name.
-    #if defined(__GLIBCXX__)
+// Before GCC 5, is_trivially_copyable had a pre-standard name.
+#if defined(__GLIBCXX__) && (__GLIBCXX__ < 20150801)
+    namespace std {
         template <typename T>
-        using is_trivially_copyable = std::has_trivial_copy_constructor<T>;
-    #else
-        template <typename T>
-        using is_trivially_copyable = std::is_trivially_copyable<T>;
-    #endif
-}
+        using is_trivially_copyable = has_trivial_copy_constructor<T>;
+    }
+#endif
 
 // SkFixedAlloc allocates POD objects out of a fixed-size buffer.
 class SkFixedAlloc {
@@ -35,7 +32,8 @@
     // Allocates space suitable for a T.  If we can't, returns nullptr.
     template <typename T>
     void* alloc() {
-        static_assert(std::is_standard_layout<T>::value && is_trivially_copyable<T>::value, "");
+        static_assert(std::is_standard_layout   <T>::value
+                   && std::is_trivially_copyable<T>::value, "");
         return this->alloc(sizeof(T), alignof(T));
     }