Embedding-CSP: Adding `const` to method signatures.

third_party/WebKit/Source/core/frame/csp/CSPSource.h

Index: third_party/WebKit/Source/core/frame/csp/CSPSource.h
diff --git a/third_party/WebKit/Source/core/frame/csp/CSPSource.h b/third_party/WebKit/Source/core/frame/csp/CSPSource.h
index 3a4739cfccbbd2ca18d7efd6703940dda2e81cdb..33ae85f44c078ab6ea153c4ea7574cad62b6a58a 100644
--- a/third_party/WebKit/Source/core/frame/csp/CSPSource.h
+++ b/third_party/WebKit/Source/core/frame/csp/CSPSource.h
@@ -36,15 +36,15 @@ class CORE_EXPORT CSPSource : public GarbageCollectedFinalized<CSPSource> {
 
   // Returns true if this CSPSource subsumes the other, as defined by the
   // algorithm at https://w3c.github.io/webappsec-csp/embedded/#subsume-policy
-  bool subsumes(CSPSource*);
+  bool subsumes(CSPSource*) const;
   // Retrieve the most restrictive information from the two CSPSources if
   // isSimilar is true for the two. Otherwise, return nullptr.
-  CSPSource* intersect(CSPSource*);
+  CSPSource* intersect(CSPSource*) const;
   // Returns true if the first list subsumes the second, as defined by the
   // algorithm at
   // https://w3c.github.io/webappsec-csp/embedded/#subsume-source-list
-  static bool firstSubsumesSecond(HeapVector<Member<CSPSource>>,
-                                  HeapVector<Member<CSPSource>>);
+  static bool firstSubsumesSecond(const HeapVector<Member<CSPSource>>&,
+                                  const HeapVector<Member<CSPSource>>&);
 
   DECLARE_TRACE();
 
@@ -64,7 +64,7 @@ class CORE_EXPORT CSPSource : public GarbageCollectedFinalized<CSPSource> {
   bool pathMatches(const String&) const;
   // Protocol is necessary to determine default port if it is zero.
   bool portMatches(int port, const String& protocol) const;
-  bool isSimilar(CSPSource* other);
+  bool isSimilar(CSPSource* other) const;
 
   Member<ContentSecurityPolicy> m_policy;
   String m_scheme;