Adding unit tests for google_api_keys functionality.

google_apis/google_api_keys.cc

Index: google_apis/google_api_keys.cc
diff --git a/google_apis/google_api_keys.cc b/google_apis/google_api_keys.cc
index 70d0a1272e0d2464d38f9fd9463745f7a9eaee75..830a135d95931a2a5d6983c6d780773048c1114c 100644
--- a/google_apis/google_api_keys.cc
+++ b/google_apis/google_api_keys.cc
@@ -94,8 +94,6 @@ const char kOAuth2ClientSecret[] = "oauth2-client-secret";
 
 namespace google_apis {
 
-namespace {
-
 // This is used as a lazy instance to determine keys once and cache them.
 class APIKeyCache {
  public:
@@ -239,8 +237,6 @@ class APIKeyCache {
 static base::LazyInstance<APIKeyCache> g_api_key_cache =
     LAZY_INSTANCE_INITIALIZER;
 
-}  // namespace
-
 std::string GetAPIKey() {
   return g_api_key_cache.Get().api_key();
 }