Fully launch CopylessPaste

Set CopylessPaste to be enabled by default.

BUG=682077

Change-Id: Ia51f540b39689e1b7b8b4c819163787b4c95378f
Reviewed-on: https://chromium-review.googlesource.com/567555Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485967}

chrome/common/chrome_features.cc

@@ -134,7 +134,7 @@ const base::Feature kConsistentOmniboxGeolocation{
 #if defined(OS_ANDROID)
 // Experiment to extract structured metadata for app indexing.
 const base::Feature kCopylessPaste{"CopylessPaste",
-                                   base::FEATURE_DISABLED_BY_DEFAULT};
+                                   base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 #if defined(OS_WIN)