Fix incorrect usage of std::remove_if (#2172)

b/319037247

starboard/loader_app/drain_file.cc

@@ -98,7 +98,8 @@ void Rank(const char* dir, char* app_key, size_t len) {
 
   std::vector<std::string> filenames = FindAllWithPrefix(dir, kDrainFilePrefix);
 
-  std::remove_if(filenames.begin(), filenames.end(), IsExpired);
+  filenames.erase(std::remove_if(filenames.begin(), filenames.end(), IsExpired),
+                  filenames.end());
 
   if (filenames.empty())
     return;

starboard/loader_app/drain_file_test.cc

@@ -174,6 +174,29 @@ TEST_F(DrainFileTest, SunnyDayRankCorrectlyRanksFiles) {
   EXPECT_TRUE(SbFileDelete(later_and_greatest.path().c_str()));
 }
 
+// Ranking drain files should ignore expired files.
+TEST_F(DrainFileTest, SunnyDayRankCorrectlyIgnoresExpired) {
+  const SbTime timestamp = SbTimeGetNow();
+
+  ScopedDrainFile early_and_expired(GetTempDir(), "a",
+                                    timestamp - kDrainFileMaximumAge);
+  ScopedDrainFile later_and_least(GetTempDir(), "c", timestamp);
+  ScopedDrainFile later_and_greatest(GetTempDir(), "b",
+                                     timestamp + kDrainFileAgeUnit);
+
+  std::vector<char> result(kSbFileMaxName);
+
+  EXPECT_TRUE(DrainFileRankAndCheck(GetTempDir(), "c"));
+  EXPECT_TRUE(SbFileDelete(later_and_least.path().c_str()));
+
+  EXPECT_TRUE(DrainFileRankAndCheck(GetTempDir(), "b"));
+  EXPECT_TRUE(SbFileDelete(later_and_greatest.path().c_str()));
+
+  // Even though "a" is still there Rank should find nothing since it's expired.
+  EXPECT_TRUE(DrainFileRankAndCheck(GetTempDir(), ""));
+  EXPECT_TRUE(SbFileDelete(early_and_expired.path().c_str()));
+}
+
 // All files in the directory should be cleared except for drain files with an
 // app key matching the provided app key.
 TEST_F(DrainFileTest, SunnyDayPrepareDirectory) {