Prepare push to trunk. Now working on 3.19.19.

ChangeLog

Index: ChangeLog
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+2013-06-18: Version 3.19.18
+
+	Fixed read-only attribute of Function.length in strict mode.
+	(issue 2705)
+
+	Fix Runtime_SetProperty to properly handle OOM failures

[Jakob Kummerow, 2013/06/18 11:33:02]

nit: we prefer the past tense in ChangeLog entries.

+	(Chromium issue 249873)
+
+	Emit deprecated check for constant function transitions.
+	(Chromium issue 250609)
+	
+	Make MathFloorOfDiv optimization trigger more often
+	(Issue 2205)
+
+	Reland "Make more GCs in idle notification handler."
+	(Chromium issue 241815)
+
+	Increase default type info threshold.
+	(Issue 2730)
+
+        Performance and stability improvements on all platforms.
+
+
 2013-06-14: Version 3.19.16
 
         Performance and stability improvements on all platforms.