More clang warning fixes.

Mostly unused functions and variables removed.

BUG=None
TEST=ninja -C out/Debug most
     ninja -C out/Release most

R=bsalomon@google.com, caryclark@google.com, robertphillips@google.com

Author: tfarina@chromium.org

Review URL: https://codereview.chromium.org/27933002

git-svn-id: http://skia.googlecode.com/svn/trunk@11884 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkAAClip.cpp b/src/core/SkAAClip.cpp
index 9669e6f..a9d591a 100644
--- a/src/core/SkAAClip.cpp
+++ b/src/core/SkAAClip.cpp
@@ -36,9 +36,11 @@
 
 #define kMaxInt32   0x7FFFFFFF
 
+#ifdef SK_DEBUG
 static inline bool x_in_rect(int x, const SkIRect& rect) {
     return (unsigned)(x - rect.fLeft) < (unsigned)rect.width();
 }
+#endif
 
 static inline bool y_in_rect(int y, const SkIRect& rect) {
     return (unsigned)(y - rect.fTop) < (unsigned)rect.height();