BlinkGCPlugin: Fix detection of trace dispatching after inlined tracing.

This patch actually fixes three different issues, as I could not separate the
updated tests in a meaningful way.

1. CheckDispatchVisitor needs to look for UnresolvedMemberExpr*, since inlined
tracing introduces unresolved member references.

This visitor looks at every function call within a trace dispatching method,
and returns whether there is a call delegating to the class in question. We
need to take care of UnresolvedMemberExpr* cases in addition to MemberExpr*.

2. RecordInfo::DetermineTracingMethods() should return traceImpl() instead of
trace() as trace_dispatch_method_.

The plugin inspects the definition of trace_dispatch_method_ in order to detect
missing or inappropriate delegation to subclasses. Therefore, the method should
be something that has actual delegation calls in its body (i.e. traceImpl())
instead of a trampoline stub (i.e. trace()).

3. A silly typo in Config::GetTraceMethodType(). Really silly. Not sure why
I did this way.

This patch comes with updated tests for traceAfterDispatchImpl(). Now the tests
are more closer to real cases, using traceImpl to implement trace dispatching.

BUG=462511
R=kouhei@chromium.org
CC=zerny@chromium.org, oilpan-reviews@chromium.org

Review URL: https://codereview.chromium.org/968143002

Cr-Commit-Position: refs/heads/master@{#318673}

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