Revert of Modify data_reduction_proxy_header to support tamper detection logic.

Revert of Modify data_reduction_proxy_header to support tamper detection logic. (https://codereview.chromium.org/387353003/)

Reason for revert:
Causes DataReductionProxyHeadersTest.GetDataReductionProxyHeaderWithFingerprintRemoved to timeout on the bots.

TBR=bengr1@chromium.org, tonyg@chromium.org, bolian@chromium.org, yfriedman@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=381907
Original issue's description:
> 1. Adds action-parsing functionality for data reduction proxy header.
> 
> 2. Adds a couple of functions to return different fingerprint value for tamper detection.
> 
> 3. Adds a function to remove Chrome-Proxy header's fingerprint from its header values, and return the rest of header values.
> 
> 4. Changes HasDataReductionProxyViaHeader to also tell 
> whether data reduction proxy Via header occurs at the last 
> or not.
> 
> 
> BUG=381907
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287561

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287608

[robliao, 2014-08-05 21:49:26]

Created Revert of Modify data_reduction_proxy_header to support tamper detection
logic.

[commit-bot: I haz the power, 2014-08-05 21:51:56]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/robliao@chromium.org/444723003/1

[commit-bot: I haz the power, 2014-08-05 21:51:57]

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

[commit-bot: I haz the power, 2014-08-05 21:51:57]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Yaron, 2014-08-05 21:54:12]

On 2014/08/05 21:51:57, I haz the power (commit-bot) wrote:
> No LGTM from a valid reviewer yet. Only full committers are accepted.
> Even if an LGTM may have been provided, it was from a non-committer or
> a provisional committer, _not_ a full super star committer.
> See http://www.chromium.org/getting-involved/become-a-committer
> Note that this has nothing to do with OWNERS files.

lgtm

[robliao, 2014-08-05 21:54:43]

On 2014/08/05 21:54:12, Yaron wrote:
> On 2014/08/05 21:51:57, I haz the power (commit-bot) wrote:
> > No LGTM from a valid reviewer yet. Only full committers are accepted.
> > Even if an LGTM may have been provided, it was from a non-committer or
> > a provisional committer, _not_ a full super star committer.
> > See http://www.chromium.org/getting-involved/become-a-committer
> > Note that this has nothing to do with OWNERS files.
> 
> lgtm

Strange, I wonder why the NOTREECHECKS didn't make it...

[robliao, 2014-08-05 21:58:05]

The CQ bit was checked by robliao@chromium.org

[commit-bot: I haz the power, 2014-08-05 22:00:39]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/robliao@chromium.org/444723003/1

[commit-bot: I haz the power, 2014-08-05 22:03:10]

Change committed as 287608