[M41] Exclude RenderThemeChromiumLinux.cpp from the build

[M41] Exclude RenderThemeChromiumLinux.cpp from the build

This is necessary for M41, where RenderThemeChromiumLinux.cpp is newly added.
Patch fixes a linking error for desktop build by excluding it.

Note that this patch can be landed into M40, because it's fine to exclude an
non-existing file in gyp.

Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=9758
Reviewed by: Antonio Gomes, Piotr Tworek

Change-Id: Iabc4cc31cb8c052d7121246fa55a499e39a654a6
Signed-off-by: SeungSeop Park <sns.park@samsung.com>