Set the right load flag for ResourceRequests on end-to-end reloads

Set the right load flag for ResourceRequests on end-to-end reloads

https://chromiumcodereview.appspot.com/309693002/ introduces a cache policy in Blink indicating end-to-end reload. It translates to
the load flag net::LOAD_BYPASS_CACHE (instead of having blink set HTTP cache
headers "Pragma: no-cache" and "Cache-Control: no-cache".

BUG=376025
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=274807

[clamy, 2014-05-30 18:21:35]

PTAL: this is the third patch in a series of 3 to introduce a new value in blink
cache policy enums. We now handle it correctly in content. A further patch will
be needed to remove the special cases when reading cache headers in
WebURLLoaderImpl (when blink doesn't set them anymore).

[ppi, 2014-06-01 23:52:56]

Makes sense, LGTM. Yay 5-way patches :).

[clamy, 2014-06-02 05:33:37]

@jam: PTAL
This is the third patch in a series of 5 aiming at removing the setting of cache
HTTP headers in blink (and rely on the network stack instead). Currently blink
does not distinguish between LOAD_VALIDATE_CACHE and LOAD_BYPASS_CACHE in its
caching policy, and relies on setting "Pragma: no-cache" and "Cache-control:
no-cache headers instead. The second patch introduces a new value for the cache
policy. In this patch, WebURLLoaderImpl uses it to set the right load flags.

[jam, 2014-06-02 06:50:50]

lgtm

[clamy, 2014-06-04 09:03:28]

The CQ bit was checked by clamy@chromium.org

[commit-bot: I haz the power, 2014-06-04 09:05:01]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/clamy@chromium.org/308083009/1

[commit-bot: I haz the power, 2014-06-04 10:58:36]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)
  ios_dbg_simulator on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_dbg_simulator/bui...)
  linux_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_rel/bu...)

[commit-bot: I haz the power, 2014-06-04 11:21:33]

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

[commit-bot: I haz the power, 2014-06-04 11:21:33]

Try jobs failed on following builders:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)
  linux_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_rel/bu...)

[clamy, 2014-06-04 11:30:42]

The CQ bit was checked by clamy@chromium.org

[commit-bot: I haz the power, 2014-06-04 11:31:37]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/clamy@chromium.org/308083009/1

[commit-bot: I haz the power, 2014-06-04 13:31:22]

Change committed as 274807