Fix uninitialized RenderFrameImpl member variable
Fix uninitialized RenderFrameImpl member variable

The initialization was left inside an Android ifdef after the
declaration was moved out of one, which resulted in an uninitialized
variable on platforms other than Android.

BUG=588177

Review URL: https://codereview.chromium.org/1713173002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#376566}

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