DevTools: only set title w/ shortcut via Tooltip manager API.

Source/devtools/front_end/emulation/ResponsiveDesignView.js

Index: Source/devtools/front_end/emulation/ResponsiveDesignView.js
diff --git a/Source/devtools/front_end/emulation/ResponsiveDesignView.js b/Source/devtools/front_end/emulation/ResponsiveDesignView.js
index e9c1c8102daba370ca128e62f624b60898ee97c7..f6fdd51018f9fac647ac00c9bad40e2223695947 100644
--- a/Source/devtools/front_end/emulation/ResponsiveDesignView.js
+++ b/Source/devtools/front_end/emulation/ResponsiveDesignView.js
@@ -95,7 +95,7 @@ WebInspector.ResponsiveDesignView.prototype = {
         this._decreasePageScaleButton.addEventListener("click", this._pageScaleButtonClicked.bind(this, false), false);
 
         this._pageScaleLabel = this._pageScaleContainer.createChild("label", "responsive-design-page-scale-label");
-        WebInspector.Tooltip.install(this._pageScaleLabel, WebInspector.UIString("Shift + drag to change page scale"));
+        this._pageScaleLabel.title = WebInspector.UIString("Shift + drag to change page scale");
         this._pageScaleLabel.addEventListener("dblclick", this._resetPageScale.bind(this), false);
 
         this._increasePageScaleButton = this._pageScaleContainer.createChild("button", "responsive-design-page-scale-button responsive-design-page-scale-increase");
@@ -539,9 +539,9 @@ WebInspector.ResponsiveDesignView.prototype = {
 
         if (viewportChanged) {
             this._pageScaleLabel.textContent = WebInspector.UIString("%.1f", this._viewport.pageScaleFactor);
-            WebInspector.Tooltip.install(this._decreasePageScaleButton, WebInspector.UIString("Scale down (minimum %.1f)", this._viewport.minimumPageScaleFactor));
+            this._decreasePageScaleButton.title = WebInspector.UIString("Scale down (minimum %.1f)", this._viewport.minimumPageScaleFactor);
             this._decreasePageScaleButton.disabled = this._viewport.pageScaleFactor <= this._viewport.minimumPageScaleFactor;
-            WebInspector.Tooltip.install(this._increasePageScaleButton, WebInspector.UIString("Scale up (maximum %.1f)", this._viewport.maximumPageScaleFactor));
+            this._increasePageScaleButton.title = WebInspector.UIString("Scale up (maximum %.1f)", this._viewport.maximumPageScaleFactor);
             this._increasePageScaleButton.disabled = this._viewport.pageScaleFactor >= this._viewport.maximumPageScaleFactor;
         }
 
@@ -607,7 +607,7 @@ WebInspector.ResponsiveDesignView.prototype = {
 
         var moreButtonContainer = this._toolbarElement.createChild("div", "responsive-design-more-button-container");
         var moreButton = moreButtonContainer.createChild("button", "responsive-design-more-button");
-        WebInspector.Tooltip.install(moreButton, WebInspector.UIString("More overrides"));
+        moreButton.title = WebInspector.UIString("More overrides");
         moreButton.addEventListener("click", this._showEmulationInDrawer.bind(this), false);
         moreButton.textContent = "\u2026";
     },
@@ -672,7 +672,7 @@ WebInspector.ResponsiveDesignView.prototype = {
         var resolutionFieldset2 = WebInspector.SettingsUI.createSettingFieldset(WebInspector.overridesSupport.settings.emulateResolution);
         dprElement.appendChild(resolutionFieldset2);
         var dprButton = resolutionFieldset2.createChild("div", "responsive-design-icon responsive-design-icon-dpr");
-        WebInspector.Tooltip.install(dprButton, WebInspector.UIString("Device pixel ratio"));
+        dprButton.title = WebInspector.UIString("Device pixel ratio");
         resolutionFieldset2.appendChild(WebInspector.SettingsUI.createSettingInputField("", WebInspector.overridesSupport.settings.deviceScaleFactor, true, 4, "1.9em", WebInspector.OverridesSupport.deviceScaleFactorValidator, true, true, WebInspector.UIString("\u2013")));
 
         // Fit to window.