Cleanup include guards:

src/usage-analyzer.h

Index: src/usage-analyzer.h
diff --git a/src/usage-analyzer.h b/src/usage-analyzer.h
index 2732dd5766e30a7ba2b3bc35f79b5dfb43e2f8ac..2369422b9c46d8928aca71f59785da992f8e2ca0 100644
--- a/src/usage-analyzer.h
+++ b/src/usage-analyzer.h
@@ -25,8 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef V8_USAGE_ANALYSER_H_
-#define V8_USAGE_ANALYSER_H_
+#ifndef V8_USAGE_ANALYZER_H_
+#define V8_USAGE_ANALYZER_H_
 
 namespace v8 { namespace internal {
 
@@ -36,4 +36,4 @@ bool AnalyzeVariableUsage(FunctionLiteral* lit);
 
 } }  // namespace v8::internal
 
-#endif  // V8_USAGE_ANALYSER_H_
+#endif  // V8_USAGE_ANALYZER_H_