Fix code style violation in compiler/preprocessor

BUG=angle:650
TEST=no behavior change

Change-Id: Ib52f15f6471fc7897b66d11baee11216cf08158a
Reviewed-on: https://chromium-review.googlesource.com/199591
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Tested-by: Zhenyao Mo <zmo@chromium.org>
diff --git a/src/compiler/preprocessor/DirectiveHandlerBase.h b/src/compiler/preprocessor/DirectiveHandlerBase.h
index 2aaeec2..040b25c 100644
--- a/src/compiler/preprocessor/DirectiveHandlerBase.h
+++ b/src/compiler/preprocessor/DirectiveHandlerBase.h
@@ -23,19 +23,19 @@
   public:
     virtual ~DirectiveHandler();
 
-    virtual void handleError(const SourceLocation& loc,
-                             const std::string& msg) = 0;
+    virtual void handleError(const SourceLocation &loc,
+                             const std::string &msg) = 0;
 
     // Handle pragma of form: #pragma name[(value)]
-    virtual void handlePragma(const SourceLocation& loc,
-                              const std::string& name,
-                              const std::string& value) = 0;
+    virtual void handlePragma(const SourceLocation &loc,
+                              const std::string &name,
+                              const std::string &value) = 0;
 
-    virtual void handleExtension(const SourceLocation& loc,
-                                 const std::string& name,
-                                 const std::string& behavior) = 0;
+    virtual void handleExtension(const SourceLocation &loc,
+                                 const std::string &name,
+                                 const std::string &behavior) = 0;
 
-    virtual void handleVersion(const SourceLocation& loc,
+    virtual void handleVersion(const SourceLocation &loc,
                                int version) = 0;
 };