Enable Touch Feedback Experiment by default
Change touch feedback switch to be a disabling switch. Update locations currently referencing the switch. Update unittests to no longer set the flag as it will be on by default.

TEST=SystemTrayTest.TrayPopupItemContainerTouchFeedback, SystemTrayTest.TrayPopupItemContainerTouchFeedbackCancellation, TrayDetailsViewTest.HoverHighlightViewTouchFeedback, TrayDetailsViewTest.HoverHighlightViewTouchFeedbackCancellation, MenuButtonTest.TouchFeedbackDuringTap, MenuButtonTest.TouchFeedbackDuringTapCancel

Review URL: https://codereview.chromium.org/752163003

Cr-Commit-Position: refs/heads/master@{#306298}
diff --git a/ui/base/ui_base_switches.cc b/ui/base/ui_base_switches.cc
index 24d0d553..abf7f63 100644
--- a/ui/base/ui_base_switches.cc
+++ b/ui/base/ui_base_switches.cc
@@ -27,6 +27,9 @@
 // Disables controls that support touch base text editing.
 const char kDisableTouchEditing[] = "disable-touch-editing";
 
+// Disables additional visual feedback to touch input.
+const char kDisableTouchFeedback[] = "disable-touch-feedback";
+
 // Enables a zoomed popup bubble that allows the user to select a link.
 const char kEnableLinkDisambiguationPopup[] =
     "enable-link-disambiguation-popup";
@@ -40,9 +43,6 @@
 // Enables controls that support touch base text editing.
 const char kEnableTouchEditing[] = "enable-touch-editing";
 
-// Enables additional visual feedback to touch input.
-const char kEnableTouchFeedback[] = "enable-touch-feedback";
-
 // The language file that we want to try to open. Of the form
 // language[-country] where language is the 2 letter code from ISO-639.
 const char kLang[] = "lang";