Add WARN_UNUSED_RESULT to base::Time methods that return bool.

components/nacl/browser/pnacl_translation_cache_unittest.cc

Index: components/nacl/browser/pnacl_translation_cache_unittest.cc
diff --git a/components/nacl/browser/pnacl_translation_cache_unittest.cc b/components/nacl/browser/pnacl_translation_cache_unittest.cc
index dfc3bdefc6372d99051ff342a2c6b587ee2fa03b..057ef96ee1a65b08c847907231f1f0ccf3cc4278 100644
--- a/components/nacl/browser/pnacl_translation_cache_unittest.cc
+++ b/components/nacl/browser/pnacl_translation_cache_unittest.cc
@@ -135,7 +135,7 @@ TEST(PnaclTranslationCacheKeyTest, CacheKeyTest) {
   info.opt_level = 0;
   info.sandbox_isa = "x86-32";
   std::string test_time("Wed, 15 Nov 1995 06:25:24 GMT");
-  base::Time::FromString(test_time.c_str(), &info.last_modified);
+  EXPECT_TRUE(base::Time::FromString(test_time.c_str(), &info.last_modified));
   // Basic check for URL and time components
   EXPECT_EQ("ABI:0;opt:0;URL:http://www.google.com/;"
             "modified:1995:11:15:6:25:24:0:UTC;etag:;"
@@ -204,7 +204,7 @@ TEST(PnaclTranslationCacheKeyTest, CacheKeyTest) {
             "sandbox:x86-32;extra_flags:-mavx-neon;",
             PnaclTranslationCache::GetKey(info));
   test_time.assign("Fri, 29 Feb 2008 13:04:12 GMT");
-  base::Time::FromString(test_time.c_str(), &info.last_modified);
+  EXPECT_TRUE(base::Time::FromString(test_time.c_str(), &info.last_modified));
   EXPECT_EQ("ABI:2;opt:2;URL:http://www.google.com/;"
             "modified:2008:2:29:13:4:12:0:UTC;etag:etag;"
             "sandbox:x86-32;extra_flags:-mavx-neon;",