Allocator shim explanatory error message.

base/allocator/allocator_shim_override_glibc_weak_symbols.h

Index: base/allocator/allocator_shim_override_glibc_weak_symbols.h
diff --git a/base/allocator/allocator_shim_override_glibc_weak_symbols.h b/base/allocator/allocator_shim_override_glibc_weak_symbols.h
index dda49aa38354eb0e470aff44d8f80f1c340b8bae..1b9e50c23912312dbe77cd180a672bce1341fdca 100644
--- a/base/allocator/allocator_shim_override_glibc_weak_symbols.h
+++ b/base/allocator/allocator_shim_override_glibc_weak_symbols.h
@@ -105,5 +105,7 @@ SHIM_ALWAYS_EXPORT int __posix_memalign(void** r, size_t a, size_t s)
 
 // Safety check.
 #if !defined(__GLIBC__)
-#error The current platform does not seem to use Glibc.
+#error The target platform does not seem to use Glibc and allocator shim \
+has no idea how to support target's libc. Please disable this feature \

[Primiano Tucci (use gerrit), 2016/10/06 13:08:32]

I'd keep it shorter and just say:
"The target platform does not seem to use Glibc. Disable the allocator shim by
setting 'use_experimental_allocator_shim=false' in GN args."

+setting 'use_experimental_allocator_shim=false' in GN args. Sorry.
 #endif