[VK] Enable virtual keyboard UKM by default on M70.

Launch was approved.

Bug: 752657
Change-Id: I01ac04040b8b928c27512d203667dda234588153
Reviewed-on: https://chromium-review.googlesource.com/1184659Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585282}

ui/base/ui_base_features.cc

@@ -40,7 +40,7 @@ const base::Feature kEnableVirtualKeyboardMdUi = {
     "EnableVirtualKeyboardMdUi", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kEnableVirtualKeyboardUkm = {
-    "EnableVirtualKeyboardUkm", base::FEATURE_DISABLED_BY_DEFAULT};
+    "EnableVirtualKeyboardUkm", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables all upcoming UI features.
 const base::Feature kExperimentalUi{"ExperimentalUi",