remove filelock which is now unused

R=pthatcher@webrtc.org

Committed: https://crrev.com/5ece00f7fa15407314aa27ae5c262a86f004468a
Cr-Commit-Position: refs/heads/master@{#9222}

Review URL: https://webrtc-codereview.appspot.com/51859004

Cr-Commit-Position: refs/heads/master@{#9225}
diff --git a/webrtc/base/bitbuffer_unittest.cc b/webrtc/base/bitbuffer_unittest.cc
index 89d3524..21cffd6 100644
--- a/webrtc/base/bitbuffer_unittest.cc
+++ b/webrtc/base/bitbuffer_unittest.cc
@@ -164,12 +164,8 @@
   EXPECT_EQ(0u, bit_offset);
   EXPECT_FALSE(buffer.Seek(4, 1));
 
-  // Disable death test on Android because it relies on fork() and doesn't play
-  // nicely.
-#if !defined(WEBRTC_ANDROID)
   // Passing a NULL out parameter is death.
   EXPECT_DEATH(buffer.GetCurrentOffset(&byte_offset, NULL), "");
-#endif
 }
 
 uint64 GolombEncoded(uint32 val) {