Revert of Handle long press in PDF documents.

chrome/browser/resources/pdf/gesture_detector.js

Index: chrome/browser/resources/pdf/gesture_detector.js
diff --git a/chrome/browser/resources/pdf/gesture_detector.js b/chrome/browser/resources/pdf/gesture_detector.js
index 091707649d2072235ef1aae33be0f23886b12f09..b8b1a7b87547add04aa5ba592f8b5683a6cd0ab2 100644
--- a/chrome/browser/resources/pdf/gesture_detector.js
+++ b/chrome/browser/resources/pdf/gesture_detector.js
@@ -26,7 +26,6 @@
         'touchcancel', this.onTouch_.bind(this), { passive: true });
 
     this.pinchStartEvent_ = null;
-    this.lastTouchTouchesCount_ = 0;
     this.lastEvent_ = null;
 
     this.listeners_ = new Map([
@@ -48,14 +47,6 @@
   }
 
   /**
-   * Returns true if the last touch start was a two finger touch.
-   * @return {boolean} True if the last touch start was a two finger touch.
-   */
-  wasTwoFingerTouch() {
-    return this.lastTouchTouchesCount_ == 2;
-  }
-
-  /**
    * Call the relevant listeners with the given |pinchEvent|.
    * @private
    * @param {!Object} pinchEvent The event to notify the listeners of.
@@ -73,16 +64,14 @@
    * @param {!TouchEvent} event Touch event on the element.
    */
   onTouchStart_(event) {
-    this.lastTouchTouchesCount_ = event.touches.length;
-    if (!this.wasTwoFingerTouch())
-      return;
-
-    this.pinchStartEvent_ = event;
-    this.lastEvent_ = event;
-    this.notify_({
-      type: 'pinchstart',
-      center: GestureDetector.center_(event)
-    });
+    if (event.touches.length == 2) {
+      this.pinchStartEvent_ = event;
+      this.lastEvent_ = event;
+      this.notify_({
+        type: 'pinchstart',
+        center: GestureDetector.center_(event)
+      });
+    }
   }
 
   /**