Replace system IO calls in chromecast/crash with Chrome utilities.

chromecast/crash/linux/synchronized_minidump_manager.cc

Index: chromecast/crash/linux/synchronized_minidump_manager.cc
diff --git a/chromecast/crash/linux/synchronized_minidump_manager.cc b/chromecast/crash/linux/synchronized_minidump_manager.cc
index 358427a2dd31a3532e82a9d6703bd78f00f161e2..c21e6255d5e9c474b8f4c98a9f3219e7c1c05d69 100644
--- a/chromecast/crash/linux/synchronized_minidump_manager.cc
+++ b/chromecast/crash/linux/synchronized_minidump_manager.cc
@@ -153,12 +153,10 @@ int SynchronizedMinidumpManager::ParseLockFile() {
   // Grab each entry.
   while (std::getline(in, entry)) {
     scoped_ptr<DumpInfo> info(new DumpInfo(entry));
-    if (info->valid() && info->crashed_process_dump().size() > 0) {
+    if (info->valid() && info->crashed_process_dump().size() > 0)
       dumps->push_back(info.Pass());
-    } else {
-      LOG(WARNING) << "Entry is not valid: " << entry;
-      return -1;
-    }
+    else
+      LOG(WARNING) << "Ignoring invalid entry: " << entry;
   }
 
   dump_metadata_ = dumps.Pass();