Revert of Split ui/base/ime into a new component (patchset #4 id:60001 of https:...

Revert of Split ui/base/ime into a new component (patchset #4 id:60001 of https://codereview.chromium.org/889323003/)

Reason for revert:
Windows builds failing with

ERROR at //ui/base/ime/BUILD.gn:170:5: Undefined variable for +=.
    libs += [ "imm32.lib" ]
    ^---
I don't have something with this name in scope now.

http://build.chromium.org/p/chromium.win/builders/Win8%20GN/builds/4403/steps/gn/logs/stdio

(perhaps missed a .gn update)?

Original issue's description:
> Split ui/base/ime into a new component
>
> The IME code in ui/base/ime depends on ui/ozone to support keyboard
> control (via the InputController interface). This dependency is
> currently missing from the build.
>
> Unfortunately, we cannot simply add this dependency, because ui/ozone
> depends on code from ui/base/cursor and ui/base/resource
> (for cursor bitmaps).
>
> Break this cycle by componentizing ui/base/ime & add a dependency
> from the new ui/base/ime component to ui/ozone.
>
> This also helps clean things up a bit because iOS builds ui/base
> but not ui/base/ime. So there is already a fault line here.
>
> The handful of IME tests are left as part of ui_base_unittests.
>
> BUG=445627
> TEST=gn gen out_gn_ozone --args='os="chromeos" use_ozone=true is_component_build=true' &&
>   ninja -C out_gn_ozone chrome ozone_unittests (along with other needed changes)
> TBR=jam
>
> Committed: https://crrev.com/2321ca1b99c1a8e9a90e48a9cd50f6446a7e5e82
> Cr-Commit-Position: refs/heads/master@{#314815}

TBR=sky@chromium.org,thakis@chromium.org,jam@chromium.org,yukishiino@chromium.org,spang@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=445627

Review URL: https://codereview.chromium.org/895363005

Cr-Commit-Position: refs/heads/master@{#314823}