Export CustomTabsConnectionService in all channels
Export CustomTabsConnectionService in all channels

Now that we have Custom Tabs confirmed for m45, export the service
in all channels. This currently breaks beta implementation giving
early adopters a SecurityException.

BUG=516874

Review URL: https://codereview.chromium.org/1272663003 .

Cr-Commit-Position: 62bea078bfe806fd4d8dc2d3869914b6c8093498@{#234}
Cr-Branched-From: ef8f355264e75087b06072b03d328c50bf72843a@{#338390}

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