[ios] Removed unused CRWWebControllerObserver methods.

ios/web/web_state/web_controller_observer_bridge.mm

Index: ios/web/web_state/web_controller_observer_bridge.mm
diff --git a/ios/web/web_state/web_controller_observer_bridge.mm b/ios/web/web_state/web_controller_observer_bridge.mm
index 35e3b08f2663414cb5aa3ce03fac291c4113be2d..6fcf90018e61770d2c1dd285cc7ffa32662e4dbd 100644
--- a/ios/web/web_state/web_controller_observer_bridge.mm
+++ b/ios/web/web_state/web_controller_observer_bridge.mm
@@ -4,11 +4,8 @@
 
 #import "ios/web/web_state/web_controller_observer_bridge.h"
 
-#include "base/bind.h"
 #include "base/logging.h"
-#include "base/strings/sys_string_conversions.h"
 #import "ios/web/public/web_state/crw_web_controller_observer.h"
-#include "ios/web/public/web_state/web_state.h"
 
 namespace web {
 
@@ -21,22 +18,9 @@ WebControllerObserverBridge::WebControllerObserverBridge(
       web_controller_(web_controller) {
   DCHECK(web_controller_observer_);
   DCHECK(web_controller_);
-
-  // Listen for script commands if needed.
-  if ([web_controller_observer_ respondsToSelector:@selector(commandPrefix)]) {
-    NSString* prefix = [web_controller_observer_ commandPrefix];
-    DCHECK_GT([prefix length], 0u);
-    script_command_callback_prefix_ = base::SysNSStringToUTF8(prefix);
-    web_state->AddScriptCommandCallback(
-        base::Bind(&WebControllerObserverBridge::ScriptCommandReceived,
-                   base::Unretained(this)),
-        script_command_callback_prefix_);
-  }
 }
 
 WebControllerObserverBridge::~WebControllerObserverBridge() {
-  if (!script_command_callback_prefix_.empty())
-    web_state()->RemoveScriptCommandCallback(script_command_callback_prefix_);
 }
 
 void WebControllerObserverBridge::PageLoaded(
@@ -46,15 +30,4 @@ void WebControllerObserverBridge::PageLoaded(
     [web_controller_observer_ pageLoaded:web_controller_];
 }
 
-bool WebControllerObserverBridge::ScriptCommandReceived(
-    const base::DictionaryValue& value,
-    const GURL& url,
-    bool user_is_interacting) {
-  DCHECK(!script_command_callback_prefix_.empty());
-  return [web_controller_observer_ handleCommand:value
-                                   webController:web_controller_
-                               userIsInteracting:user_is_interacting
-                                       originURL:url];
-}
-
 }  // namespace web