[api] Advance deprecation of v8::Message APIs

The calls in Chromium were removed in https://crrev.com/c/865535.

Bug: v8:7269, v8:7276
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: Iae9fadead1167363893b258ba2a21710a1e080a8
Reviewed-on: https://chromium-review.googlesource.com/869146Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50820}

include/v8.h

@@ -1580,7 +1580,7 @@ class V8_EXPORT Message {
  public:
   Local<String> Get() const;
 
-  V8_DEPRECATE_SOON("Use maybe version", Local<String> GetSourceLine() const);
+  V8_DEPRECATED("Use maybe version", Local<String> GetSourceLine() const);
   V8_WARN_UNUSED_RESULT MaybeLocal<String> GetSourceLine(
       Local<Context> context) const;
 
@@ -1606,7 +1606,7 @@ class V8_EXPORT Message {
   /**
    * Returns the number, 1-based, of the line where the error occurred.
    */
-  V8_DEPRECATE_SOON("Use maybe version", int GetLineNumber() const);
+  V8_DEPRECATED("Use maybe version", int GetLineNumber() const);
   V8_WARN_UNUSED_RESULT Maybe<int> GetLineNumber(Local<Context> context) const;
 
   /**
@@ -1630,7 +1630,7 @@ class V8_EXPORT Message {
    * Returns the index within the line of the first character where
    * the error occurred.
    */
-  V8_DEPRECATE_SOON("Use maybe version", int GetStartColumn() const);
+  V8_DEPRECATED("Use maybe version", int GetStartColumn() const);
   V8_WARN_UNUSED_RESULT Maybe<int> GetStartColumn(Local<Context> context) const;
 
   /**