LayoutTests: adapt test expectation to V8 change to debug-evaluate.
LayoutTests: adapt test expectation to V8 change to debug-evaluate.

Debug-evaluate soon will not be able to modify local variable values
through assignment any longer. The reason is that V8 cannot guarantee
that this will not break assumptions made by the compiler. E.g. a
variable may be considered constant by static analysis. Debug-evaluate
would break that assumption.

R=machenbach@chromium.org
BUG=chromium:569811
NOTRY=true

Review URL: https://codereview.chromium.org/1523983003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#365202}

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