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As one of the last stages of componentizing SSLErrorHandler for sharing
with WebLayer, this CL starts the process of eliminating
SSLErrorHandler's knowledge of ChromeSecurityBlockingPageFactory. To
do so, it turns ChromeSecurityBlockingPageFactory's static methods into
instance methods and has SSLErrorHandler(DelegateImpl) own an instance
of ChromeSecurityBlockingPageFactory. The next CL will introduce a
ChromeSecurityBlockingPageFactory interface and have SSLErrorHandler
talk in terms of that rather than in terms of the //chrome-level
implementation.

Bug: 1030692
Change-Id: I42f337c9f3141cd23d46d370e0dfba065e95a6bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2019242
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735347}