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With the removal of the support for javascript: URLs in tabs.update
(https://crrev.com/fd8288b18270213143), we no longer need to include
the "world type" in ScriptExecutor. This also lets us remove the
in_main_world parameter from ExtensionMsg_ExecuteCode_Params, and
clean up various bits in the renderer code in ScriptInject[or|ion] and
friends.

Bug: None

Change-Id: I7ba549d072063264645f0b9db836e8d8fad114e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835264Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: David Bertoni <dbertoni@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703155}