CHECK sourceCode.resource() == m_resource in doExecuteScript()

ScriptLoader::doExecuteScript() looks at both of |sourceCode.resource()|
and |m_resource| to obtain Resource.
Checking |sourceCode.resource()| was explicitly introduced by
https://codereview.chromium.org/185593011.
But the code structure has changed since then, e.g.
|ScriptLoader::m_resource| is no longer cleared in notifyFinished(),
so now it is better to assume ScriptLoader and ScriptSourceCode points
to the same Resource.

BUG=

Review-Url: https://codereview.chromium.org/2717493003
Cr-Commit-Position: refs/heads/master@{#453785}
1 file changed