Fixed all unused-variable Clang warnings on Windows.

ui/gfx/win/dpi.cc

Index: ui/gfx/win/dpi.cc
diff --git a/ui/gfx/win/dpi.cc b/ui/gfx/win/dpi.cc
index ceaaefde8876a7082316105178ecf58ef02733ff..c28a5f5921997fb5bd2193ec187da86636823335 100644
--- a/ui/gfx/win/dpi.cc
+++ b/ui/gfx/win/dpi.cc
@@ -14,9 +14,7 @@
 namespace {
 
 int kDefaultDPIX = 96;
-int kDefaultDPIY = 96;
-
-bool force_highdpi_for_testing = false;
+// int kDefaultDPIY = 96;

[Nico, 2015/07/02 17:34:26]

?

[Matt Giuca, 2015/07/03 03:46:29]

Again, I didn't want to delete this information from the code in case it was
needed in the future. Maybe this should just be "int kDefaultDPI = 96", implying
that X and Y have the same DPI (the code below seems to be making that
assumption anyway, which is why it uses kDefaultDPIX but not kDefaultDPIY).

 
 float g_device_scale_factor = 0.0f;