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This CL introduces ChooserResourceLoader class to replace
Platform::Current()->GetDataResource(name) with UncompressResourceAsString.

ChooserResourceLoader class supports static functions which return
a string of the given style sheet or javascript.

But, Android doesn't support IDR_FOO used by the choosers in
blink_resource.grd. So, this CL just returns String() because Android
port doesn't use the resources.

Bug: 983396
Change-Id: I2a836cc3868e2bccfd4da1449aee217396073438
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1714624Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#684281}