Remove window.postMessage(message, transferables, targetOrigin) legacy overload

third_party/WebKit/Source/core/frame/Deprecation.cpp

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
index 71b341d3d91aa224705e35739dc506bcfb5875e0..dea9bff4b840c5e0ce3f2a8e710df3c99e3525bd 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -20,16 +20,6 @@ const char* milestoneString(int milestone)
     // https://www.chromium.org/developers/calendar
 
     switch (milestone) {
-    case 50:
-        return "M50, around April 2016";
-    case 51:
-        return "M51, around May 2016";
-    case 52:
-        return "M52, around July 2016";
-    case 53:
-        return "M53, around September 2016";
-    case 54:
-        return "M54, around October 2016";
     case 55:
         return "M55, around November 2016";
     case 56:
@@ -55,11 +45,6 @@ String dopplerWillBeRemoved(const char* feature, int milestone, const char* deta
     return String::format("%s is deprecated and will be removed in %s. It has no effect as the Web Audio doppler effects have already been removed internally. See https://www.chromestatus.com/features/%s for more details.", feature, milestoneString(milestone), details);
 }
 
-String replacedWillBeRemoved(const char* feature, const char* replacement, int milestone, const char* details)
-{
-    return String::format("%s is deprecated and will be removed in %s. Please use %s instead. See https://www.chromestatus.com/features/%s for more details.", feature, milestoneString(milestone), replacement, details);
-}
-
 } // anonymous namespace
 
 namespace blink {
@@ -348,9 +333,6 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature)
     case UseCounter::HTMLKeygenElement:
         return willBeRemoved("The <keygen> element", 56, "5716060992962560");
 
-    case UseCounter::WindowPostMessageWithLegacyTargetOriginArgument:
-        return replacedWillBeRemoved("'window.postMessage(message, transferables, targetOrigin)'", "'window.postMessage(message, targetOrigin, transferables)'", 54, "5719033043222528");
-
     case UseCounter::EncryptedMediaAllSelectedContentTypesMissingCodecs:
         return String::format("EME requires that contentType strings accepted by requestMediaKeySystemAccess() include codecs. Non-standard support for contentType strings without codecs will be removed in %s. Please specify the desired codec(s) as part of the contentType.", milestoneString(54));