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This JNI layer is needed for the SendTabToSelfInfobarController to
listen for model changes  and show an infobar accordingly. This required
refactoring the code that converted the native SendTabToSelfEntry to
the Java version.

Change-Id: I2b63c2bfbfa66ac70a2fd320ae7d9652b1ff996b
Bug: 949233
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611223Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Jeffrey Cohen <jeffreycohen@chromium.org>
Reviewed-by: sebsg <sebsg@chromium.org>
Commit-Queue: Tanya Gupta <tgupta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660950}