Fix clang build if ATK_230, ATK_232 aren't defined

In this case compiler warns about function declared never referenced.

Change-Id: If8f7458c930890182c74e776dd31bb168956a693
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246167
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779326}

ui/accessibility/platform/ax_platform_node_auralinux.cc

@@ -210,13 +210,17 @@ void SetIntPointerValueIfNotNull(int* pointer, int value) {
     *pointer = value;
 }
 
+#if defined(ATK_230)
 bool SupportsAtkComponentScrollingInterface() {
   return dlsym(RTLD_DEFAULT, "atk_component_scroll_to_point");
 }
+#endif
 
+#if defined(ATK_232)
 bool SupportsAtkTextScrollingInterface() {
   return dlsym(RTLD_DEFAULT, "atk_text_scroll_substring_to_point");
 }
+#endif
 
 AtkObject* FindAtkObjectParentFrame(AtkObject* atk_object) {
   AXPlatformNodeAuraLinux* node =
@@ -1270,6 +1274,7 @@ char* GetStringAtOffset(AtkText* atk_text,
 }
 #endif
 
+#if defined(ATK_230)
 gfx::Rect GetUnclippedParentHypertextRangeBoundsRect(
     AXPlatformNodeDelegate* ax_platform_node_delegate,
     const int start_offset,
@@ -1293,6 +1298,7 @@ gfx::Rect GetUnclippedParentHypertextRangeBoundsRect(
                              AXClippingBehavior::kClipped)
              .OffsetFromOrigin();
 }
+#endif
 
 void GetCharacterExtents(AtkText* atk_text,
                          int offset,