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This patch breaks the URLRequestPrepackagedInterceptor dependencies on content/.

We want to use URLRequestPrepackagedInterceptor in unit tests that will be in components/. These tests cannot depend on content/.

BUG=371463
TBR=wtc@chromium.org

Review URL: https://codereview.chromium.org/508473002

Cr-Commit-Position: refs/heads/master@{#293861}