Change reverse scroll gesture toast content.

This CL simplifies the toast string for reverse scrolling gestures.

Bug: 1107183
Change-Id: I99dca9a8d787d39025c67b1fb8d5e319d1807659
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533873
Commit-Queue: Xiaodan Zhu <zxdan@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826628}

ash/ash_strings.grd

@@ -524,16 +524,16 @@ This file contains the strings for ash.
         Use gestures to quickly switch between apps and interact with your Chromebook in tablet mode.
       </message>
       <message name="IDS_CHANGE_ENTER_OVERVIEW_REVERSE_GESTURE" desc="The toast of changing enter overview gesture">
-        The touchpad gesture to enter Overview has changed. Swipe up with three fingers to enter Overview.
+        Swipe up with three fingers to enter Overview.
       </message>
       <message name="IDS_CHANGE_EXIT_OVERVIEW_REVERSE_GESTURE" desc="The toast of changing exit overview gesture">
-        The touchpad gesture to exit Overview has changed. Swipe down with three fingers to exit Overview.
+        Swipe down with three fingers to exit Overview.
       </message>
       <message name="IDS_CHANGE_NEXT_DESK_REVERSE_GESTURE" desc="The toast of changing reverse gesture to switch to the next desk.">
-        The touchpad gesture to switch to the next desk has changed. Swipe right with four fingers to switch to the next desk.
+        Swipe right with four fingers to switch to the next desk.
       </message>
       <message name="IDS_CHANGE_LAST_DESK_REVERSE_GESTURE" desc="The toast of changing reverse gesture to switch to the previous desk.">
-        The touchpad gesture to switch to the previous desk has changed. Swipe left with four fingers to switch to the previous desk.
+        Swipe left with four fingers to switch to the previous desk.
       </message>
       <message name="IDS_UPDATE_NOTIFICATION_MESSAGE_LEARN_MORE" desc="The body of the notification to notify that the user should restart to get system updates. This notification body links to the info page on the update.">
         Learn more about the latest <ph name="SYSTEM_APP_NAME">$1<ex>Chromium OS</ex></ph> update

ash/ash_strings_grd/IDS_CHANGE_ENTER_OVERVIEW_REVERSE_GESTURE.png.sha1

-33e60d7fae900329ccf2d68cfd7a84138a10b515
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+622f28d4eeb7b0cc390bd1e7a9f592f06178494b
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ash/ash_strings_grd/IDS_CHANGE_EXIT_OVERVIEW_REVERSE_GESTURE.png.sha1

-89bcdf911a81ba210c539d5ad983c6b8208ff9a9
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+92f4ed826ea31c87ba4f55bd171ae6a46ac706e2
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ash/ash_strings_grd/IDS_CHANGE_LAST_DESK_REVERSE_GESTURE.png.sha1

-254d8fc1e4d13f9775cfd6e2f35585b44fb6df67
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+eead565fcdee8f9d9d0b5d07715fa17b85183d0b
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ash/ash_strings_grd/IDS_CHANGE_NEXT_DESK_REVERSE_GESTURE.png.sha1

-a720949921534c6d1314ded4f45b77329bfe7320
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+743860831655432732985b7bb995b57435d940e3
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