Bug 1409148 - Remove the activation warning on the flash click-to-play overlay. r=johannh

This warning is being removed because the same warning about Flash being potentially slow is mentioned in the doorhanger that shows up when the user clicks to activate.

MozReview-Commit-ID: 3TTMflTDiYK

--HG--
extra : rebase_source : 747c5e016f050cf656bb7f3105e4cc7dcb254df3

toolkit/locales/en-US/chrome/pluginproblem/pluginproblem.dtd

@@ -3,7 +3,6 @@
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <!-- LOCALIZATION NOTE (tapToPlayPlugin): Mobile (used for touch interfaces) only has one type of plugin possible. -->
-<!ENTITY pluginActivationWarning                             "This site uses a plugin that may slow &brandShortName;.">
 <!ENTITY tapToPlayPlugin                                     "Tap here to activate plugin.">
 <!ENTITY clickToActivatePlugin                               "Activate plugin.">
 <!ENTITY checkForUpdates                                     "Check for updates…">

toolkit/pluginproblem/content/pluginProblem.xml

@@ -27,7 +27,6 @@
                 <html:label>
                     <html:button class="icon" anonid="icon"/>
                     <html:div class="msg msgVulnerabilityStatus" anonid="vulnerabilityStatus"><!-- set at runtime --></html:div>
-                    <html:div class="msg msgActivationWarning">&pluginActivationWarning;</html:div>
                     <html:div class="msg msgTapToPlay">&tapToPlayPlugin;</html:div>
                     <html:div class="msg msgClickToPlay" anonid="clickToPlay">&clickToActivatePlugin;</html:div>
                 </html:label>

toolkit/pluginproblem/content/pluginProblemContent.css

@@ -97,7 +97,6 @@ a .hoverBox,
 
 a .msgClickToPlay,
 :-moz-handler-clicktoplay .msgClickToPlay,
-:-moz-handler-clicktoplay .msgActivationWarning,
 :-moz-handler-vulnerable-updatable .msgVulnerabilityStatus,
 :-moz-handler-vulnerable-updatable .msgCheckForUpdates,
 :-moz-handler-vulnerable-updatable .msgClickToPlay,