GN: Fix Android component build

base/third_party/nspr/BUILD.gn

Index: base/third_party/nspr/BUILD.gn
diff --git a/base/third_party/nspr/BUILD.gn b/base/third_party/nspr/BUILD.gn
index ddbcbc181fff12bb0ce1fe33018850f50586a4db..516ca1f60f0dbab0c7937564c699bb40788ed383 100644
--- a/base/third_party/nspr/BUILD.gn
+++ b/base/third_party/nspr/BUILD.gn
@@ -3,7 +3,7 @@
 # found in the LICENSE file.
 
 source_set("nspr") {
-  visibility = [ "//base/*" ]
+  visibility = [ "//base" ]

[Lei Zhang, 2014/10/24 02:55:51]

willchan is on leave, and I don't understand visibility enough to say whether
this is correct or not. Maybe brettw can chime in?

[cjhopman, 2014/10/24 21:41:11]

This restricts visibility so that only "//base:base" can depend on this target.
The issue is that this is meant to be part of that shared library and it uses
things in that shared library that base doesn't export. Then, if some other
target depends directly on this (like base_unittests was) it won't be able to
link because it can't access the non-exported parts of base.

We could loosen this visibility to allow other source_sets/static_libraries that
are bundled into libbase.so to depend on this target, but that's uglier and not
currently necessary.

I'm not particularly attached to this more restricted visibility, it just makes
it harder for people to do the wrong thing.

   sources = [
     "prtime.cc",
     "prtime.h",