Improve a warning message in WebViewCore's EventHub
Improve a warning message in WebViewCore's EventHub

These warnings appear occasionally and this will help track them down.

Also removes an unused method.

Bug: 5421676
Change-Id: I5ba3f146449623e3457aafc91fd2e7edc367a9d9

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base