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We would show error message on attach failure now, we used to always return true from attachWindowAndSetUpEvents().
attachWindowAndSetUpEvents() now return the value of -internal-attach call. -internal-attach did not used to return value, now it returns the status of the attachment call from BrowserPluginBindings.

Removed 3 unused variables referring to browserPluginNode.

BUG=None

Review URL: https://codereview.chromium.org/284183013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272634 0039d316-1c4b-4281-b951-d872f2087c98