There are two places that log failure to start, tweak the message to tell

  which one it was in logs.

Review URL: https://chromiumcodereview.appspot.com/10825199

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150107 0039d316-1c4b-4281-b951-d872f2087c98

testing/iossim/iossim.mm

@@ -668,7 +668,7 @@ int main(int argc, char* const argv[]) {
   if (started) {
     [[NSRunLoop mainRunLoop] run];
   } else {
-    LogError(@"Simulator failed to start:  \"%@\" (%@:%ld)",
+    LogError(@"Simulator failed request to start:  \"%@\" (%@:%ld)",
              [error localizedDescription],
              [error domain], static_cast<long int>([error code]));
   }