Merge 127902 - Web Inspector: [REGRESSION] Content is not available for dynamically loaded script s…

Merge 127902 - Web Inspector: [REGRESSION] Content is not available for dynamically loaded script sometimes.
https://bugs.webkit.org/show_bug.cgi?id=95954

Reviewed by Yury Semikhatsky.

Source/WebCore:

Resource now loads content from request when it is available.
Content was loaded from PageAgent before where it might be not available if the resource was already GCed.

Test: http/tests/inspector/resource-tree/resource-request-content-after-loading-and-clearing-cache.html

* inspector/front-end/Resource.js:
(WebInspector.Resource.prototype._innerRequestContent.contentLoaded):
(WebInspector.Resource.prototype._innerRequestContent.resourceContentLoaded):
(WebInspector.Resource.prototype._innerRequestContent):

LayoutTests:

* http/tests/inspector/resource-tree/resource-request-content-after-loading-and-clearing-cache-expected.txt: Added.
* http/tests/inspector/resource-tree/resource-request-content-after-loading-and-clearing-cache.html: Added.
* http/tests/inspector/resource-tree/resources/dynamic-script.js: Added.
(foo):
* http/tests/inspector/resources-test.js:

TBR=vsevik@chromium.org
BUG=146823
Committed: https://trac.webkit.org/changeset/128736