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The previous code used to activate all existing keyboard layouts one
by one, then retrieve activated keyboard layout name and compare it
to US keyboard layout identifier.  The comparison failed since on
modern Windows keyboard layout name includes keyboard device identifier
(like Dvorak keyboard, etc) in the high word and this caused the last
checked keyboard layout to be left active. That layout is rarely
a US layout, which caused character to virtual key conversion API
::VkKeyScan() to fail on ASCII character keys.

The new code uses LoadKeyboardLayout() API that loads and activates
the specified keyboard layout (US English) or leaves system default
language of the system, if US English layout does not exist.

Bug: 783703
Change-Id: I2cdc1d4984131e455d30a16dbbd9c66c209e686e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521836
Commit-Queue: Shengfa Lin <shengfa@google.com>
Reviewed-by: Shengfa Lin <shengfa@google.com>
Cr-Commit-Position: refs/heads/master@{#825423}