Revert 105661 - Revert 105659 - Delay network requests on startup if any webRequest or webNavigat...

Revert 105661 - Revert 105659 - Delay network requests on startup if any webRequest or webNavigation extensions are enabled.


[Relanding 105659. This will re-cause failures in chrome_frame_net_tests, to be fixed in the next CL.]



Add a webRequest extension API permission, used to tell when an extension uses that API and therefore wants to delay startup. Use the "tabs" warning for it.

Also clean up the UserScriptListener, which never released requests individually and so doesn't need to track them individually either, and makes the RequestQueue handle bulk releases by its delegates instead.



BUG=99450
TEST=unit_tests.exe --gtest_filter=NetworkDelayListenerTest.*



Review URL: http://codereview.chromium.org/8205001





TBR=pam@chromium.org

Review URL: http://codereview.chromium.org/8296017



TBR=pam@chromium.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=105686