Add base:: to string16s in chrome_elf/.

chrome_elf/blacklist/test/blacklist_test.cc

Index: chrome_elf/blacklist/test/blacklist_test.cc
diff --git a/chrome_elf/blacklist/test/blacklist_test.cc b/chrome_elf/blacklist/test/blacklist_test.cc
index 6556e25cc532688c5464e11099f783f98f49e72b..dbb662f97114684b3bd2d2aa45d6156b41082bd5 100644
--- a/chrome_elf/blacklist/test/blacklist_test.cc
+++ b/chrome_elf/blacklist/test/blacklist_test.cc
@@ -72,7 +72,7 @@ TEST_F(BlacklistTest, AddAndRemoveModules) {
   EXPECT_TRUE(blacklist::RemoveDllFromBlacklist(L"foo.dll"));
   EXPECT_FALSE(blacklist::RemoveDllFromBlacklist(L"foo.dll"));
 
-  std::vector<string16> added_dlls;
+  std::vector<base::string16> added_dlls;
   added_dlls.reserve(blacklist::kTroublesomeDllsMaxCount);
   for (int i = 0; i < blacklist::kTroublesomeDllsMaxCount; ++i) {
     added_dlls.push_back(base::IntToString16(i) + L".dll");