Move ExtensionHost from src/chrome to src/extensions

chrome/browser/extensions/extension_view_host.cc

Index: chrome/browser/extensions/extension_view_host.cc
diff --git a/chrome/browser/extensions/extension_view_host.cc b/chrome/browser/extensions/extension_view_host.cc
index 9eb6d79889a3397980a4227b60bb13bb8c51829c..3c86e27adcd45ed486e08b2b99a093f8c0c825c9 100644
--- a/chrome/browser/extensions/extension_view_host.cc
+++ b/chrome/browser/extensions/extension_view_host.cc
@@ -21,6 +21,7 @@
 #include "extensions/browser/runtime_data.h"
 #include "extensions/common/extension_messages.h"
 #include "grit/browser_resources.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 
@@ -222,6 +223,15 @@ void ExtensionViewHost::HandleKeyboardEvent(
   UnhandledKeyboardEvent(source, event);
 }
 
+bool ExtensionViewHost::PreHandleGestureEvent(
+    content::WebContents* source,
+    const blink::WebGestureEvent& event) {
+  // Disable pinch zooming.
+  return event.type == blink::WebGestureEvent::GesturePinchBegin ||
+      event.type == blink::WebGestureEvent::GesturePinchUpdate ||
+      event.type == blink::WebGestureEvent::GesturePinchEnd;
+}
+
 content::ColorChooser* ExtensionViewHost::OpenColorChooser(
     WebContents* web_contents,
     SkColor initial_color,