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Part of the new clear browsing data dialog cleanup effort. This change
removes the feature flag definition.

Bug: 947456
Change-Id: I2231e58c58583ba6b825a32c6390937b0894f9ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985012
Commit-Queue: Huanzhong Huang <huanzhong@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729704}