Move remaining KeyCode files to platform/

Move remaining KeyCode files to platform/

This is a reland of r164107 (which was reverted due to an Android build error).
https://codereview.chromium.org/111403004

There was a missing #include in KeyCodeConversionAndroid.cpp which prevented a function from being exported from the platform component.

BUG=297477, 329743
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=164363

[jbroman, 2013-12-21 03:43:53]

Patch Set 1 is the originally landed patch set (which was reverted); Patch Set 2
adds an include of KeyCodeConversion.h in KeyCodeConversionAndroid.cpp, which
causes the PLATFORM_EXPORT declaration to take effect and thus not break the
Android build.

Observe that the problematic error occurs in the android_clang_dbg trybot run in
Patch Set 1, but does not in Patch Set 2.

[Dirk Pranke, 2013-12-21 03:52:41]

Ah, somehow I totally missed that the include was missing :(. LGTM.

[eseidel, 2013-12-27 17:22:51]

lgtm

[commit-bot: I haz the power, 2013-12-27 17:23:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jbroman@chromium.org/106103009/40001

[commit-bot: I haz the power, 2013-12-27 19:02:36]

Change committed as 164363