Revert of Revert "Revert of Moving gRPC support interfaces out of cronet and into a new component. (patchset …

Revert of Revert "Revert of Moving gRPC support interfaces out of cronet and into a new component. (patchset … (patchset #5 id:100001 of https://codereview.chromium.org/2470923002/ )

Reason for revert:
Causing components_unittests failure on 

https://uberchromegw.corp.google.com/i/chromium.linux/builders/Android%20Tests/builds/34458/steps/components_unittests%20on%20Android/logs/stdio

Original issue's description:
> Reland refactor of gRPC. Previous CL was reverted because it used a fixed port for testing, which was sometimes occupied. The test now uses dynamically bound ports for Cronet as well as the grpc_support unittest.
> 
> Revert "Revert of Moving gRPC support interfaces out of cronet and into a new component. (patchset #67 id:1300001 of https://codereview.chromium.org/2273403003/ )"
> 
> This reverts commit 3b72ebe609598fa876ddd2af0b61636a225486c1.
> 
> TBR=blundell@chromium.org
> BUG=650462
> 
> Committed: https://crrev.com/47cd6404f5dbcf436a4dd0e1685498da2ec3f4fe
> Cr-Commit-Position: refs/heads/master@{#430995}

TBR=mef@chromium.org,gcasto@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=650462

[mikecase (-- gone --), 2016-11-09 23:45:08]

The CQ bit was checked by mikecase@chromium.org

[mikecase (-- gone --), 2016-11-09 23:45:08]

Created Revert of Revert "Revert of Moving gRPC support interfaces out of cronet
and into a new component. (patchset …

[commit-bot: I haz the power, 2016-11-09 23:49:54]

The CQ bit was unchecked by commit-bot@chromium.org