Remove CHECK from GetThreadName.

It's safe for prctl() to fail, so we fall back on <noname> for thread names if we can't get one, instead of crashing.

BUG=
R=henrika@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/57529004

Cr-Commit-Position: refs/heads/master@{#9363}

talk/app/webrtc/java/jni/jni_helpers.cc

@@ -111,9 +111,9 @@ static std::string GetThreadId() {
 
 // Return the current thread's name.
 static std::string GetThreadName() {
-  char name[17];
-  CHECK_EQ(0, prctl(PR_GET_NAME, name)) << "prctl(PR_GET_NAME) failed";
-  name[16] = '\0';
+  char name[17] = {0};
+  if (prctl(PR_GET_NAME, name) != 0)
+    return std::string("<noname>");
   return std::string(name);
 }