Fix LNK1210 when linking blink_core.dll in gn builds.
Fix LNK1210 when linking blink_core.dll in gn builds.

This matches the 'LinkIncremental': '1' for webcore_shared
in core.gyp ('1' means 'off' for LinkIncremental).

Patch dictated by scottmg over a noisy channel; typing and
denoising by me.

BUG=587530
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/1709783002 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#376000}

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