Remove enable/disable wheel gestures setting.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 1860101f5d915cb4e0fa73b5f2c7207ce26fea9b..443a2b803ef0a1644352d0f559d59d2d6be8053a 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -305,9 +305,6 @@ const char kDisableWebSecurity[]            = "disable-web-security";
 // Disables Blink's XSSAuditor. The XSSAuditor mitigates reflective XSS.
 const char kDisableXSSAuditor[]             = "disable-xss-auditor";
 
-// Disable gesture generation for wheel events.
-const char kDisableWheelGestures[] = "disable-wheel-gestures";
-
 // Disable rasterizer that writes directly to GPU memory associated with tiles.
 const char kDisableZeroCopy[]                = "disable-zero-copy";
 
@@ -516,9 +513,6 @@ const char kEnableWebGLImageChromium[] = "enable-webgl-image-chromium";
 // Enables interaction with virtual reality devices.
 const char kEnableWebVR[] = "enable-webvr";
 
-// Enables gesture generation for wheel events.
-const char kEnableWheelGestures[] = "enable-wheel-gestures";
-
 // Enable rasterizer that writes directly to GPU memory associated with tiles.
 const char kEnableZeroCopy[]                = "enable-zero-copy";