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Showcase is intended to be a standalone UI app and as such should not reference 
//ios/web or //ios/chrome. This CL eliminates the Showcase app creating an IOSChromeMain 
instance and thus implicitly being an //ios/web embedder, instead directly inlining the 
minimal parts of that startup that are needed (initializing base::CommandLine and loading resources).
 
As part of that change, this CL eliminates Showcase bundling //ios/web resources.

Bug: 738880
Change-Id: Idcd7849927e1d56fa1958de34e145beb362f4c3a
Reviewed-on: https://chromium-review.googlesource.com/568243
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Louis Romero <lpromero@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486253}