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Fix for how webview.executeScript and webivew.insertCSS check for page navigtation when loading data URLs via NavigationController::LoadURLWithParams.

Tests will follow shortly in the patch that adds webview.loadDataWithBaseURL.

BUG=417816

TBR=rockot@chromium.org

Review URL: https://codereview.chromium.org/602193002

Cr-Commit-Position: refs/heads/master@{#296938}