base: Fix build issues on trusty and jessie.

base/template_util.h

Index: base/template_util.h
diff --git a/base/template_util.h b/base/template_util.h
index 0dc6c952826b1e7cc03d1834327465847ffb6dfb..80a24d1722e2c466e31d2e09f483a4a73a45e90b 100644
--- a/base/template_util.h
+++ b/base/template_util.h
@@ -23,11 +23,14 @@
 #define CR_USE_FALLBACKS_FOR_OLD_GLIBCXX
 #endif
 
-// Some chromeos bots are using experimental 5.0 for some reason
-// which has partial support for type_traits, but misses a smaller subset
-// while removing some of the older non-standard stuff.
+// Some versions of libstdc++ have partial support for type_traits, but misses
+// a smaller subset while removing some of the older non-standard stuff.
+#define CR_GLIBCXX_4_8_4 20141219
+#define CR_GLIBCXX_4_9_2 20150426
 #define CR_GLIBCXX_5_0_0 20150123
-#if defined(__GLIBCXX__) && (__GLIBCXX__ == CR_GLIBCXX_5_0_0)
+#if defined(__GLIBCXX__) &&                                                \
+    (__GLIBCXX__ == CR_GLIBCXX_4_8_4 || __GLIBCXX__ == CR_GLIBCXX_4_9_2 || \
+     __GLIBCXX__ == CR_GLIBCXX_5_0_0)
 #define CR_USE_FALLBACKS_FOR_OLD_EXPERIMENTAL_GLIBCXX
 #endif