Add ability to edit response bodies in recorded archive and improve functions for viewing them.
Add ability to edit response bodies in recorded archive and
improve functions for viewing them.

Review URL: http://codereview.chromium.org/6384018

git-svn-id: abd770af2affaf62930f25b244f6edafe8ddae5b@256 164481a5-15cb-f69f-4b93-856c5b7754c5

ting-yuan/web-page-replay,bpsinc-native/src_third_party_webpagereplay,colin-scott/web-page-replay,ting-yuan/web-page-replay,bpsinc-native/src_third_party_webpagereplay,snorp/web-page-replay,snorp/web-page-replay,colin-scott/web-page-replay,chromium/web-page-replay,andrey-malets/web-page-replay,andrey-malets/web-page-replay,bpsinc-native/src_third_party_webpagereplay,chromium/web-page-replay