Update uninstall dialog heading from Remove to Uninstall.

Currently, the uninstallation dialog head text is inconsistency for the
ARC apps and extension apps. ARC apps use Uninstall, and Remove for the
shortcut only, because for the shortcut, ARC apps use the extension
apps' IDS_EXTENSION_UNINSTALL_PROMPT_HEADING. Per request from the bug,
change the head text from Remove to Uninstall, and remove the quotes.
Linux apps use Uninstall as well, so I think Uninstall sounds better.

BUG=1010303
TBR=rdevlin.cronin@chromium.org

Change-Id: I0e939943c37c295ebe2c8a73824c235420a98195
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844756Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704004}

chrome/app/generated_resources.grd

@@ -3492,7 +3492,7 @@ are declared in tools/grit/grit_rule.gni.
         Add "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>"?
       </message>
       <message name="IDS_EXTENSION_UNINSTALL_PROMPT_HEADING" desc="First bold line in the content area of the extension or app uninstallation prompt. Asks the user if they want to uninstall a particular extension or app.">
-        Remove "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>"?
+        Uninstall <ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>?
       </message>
       <message name="IDS_EXTENSION_PROGRAMMATIC_UNINSTALL_PROMPT_HEADING" desc="First bold line in the content area of the extension or app uninstallation prompt when the uninstallation is programmatically triggered by another extension. Asks the user if they want to uninstall a particular extension or app.">
         "<ph name="TRIGGERING_EXTENSION_NAME">$1<ex>Extension Manager</ex></ph>" would like to remove "<ph name="EXTENSION_NAME">$2<ex>Gmail Checker</ex></ph>".
@@ -4258,7 +4258,7 @@ Keep your key file in a safe place. You will need it to create new versions of y
         Report abuse from "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>"
       </message>
       <message name="IDS_EXTENSION_PROMPT_UNINSTALL_TITLE" desc="Title text for removing an extension.">
-        Remove "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>"?
+        Uninstall <ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>?
       </message>
       <message name="IDS_EXTENSION_PROMPT_UNINSTALL_APP_BUTTON" desc="Text for the uninstall button on the non-platform app and ARC(App Runtime for Chrome) app uninstall prompt">
         Uninstall

chrome/app/generated_resources_grd/IDS_EXTENSION_PROMPT_UNINSTALL_TITLE.png.sha1

+e902b07e3e1424692c643628b124f58d746e3ad8
\ No newline at end of file

chrome/app/generated_resources_grd/IDS_EXTENSION_UNINSTALL_PROMPT_HEADING.png.sha1

+0f2448350c91b414100ca3e56ea493fc40796335
\ No newline at end of file

chrome/browser/extensions/api/management/management_api_unittest.cc

@@ -367,7 +367,7 @@ TEST_F(ManagementApiUnitTest, ManagementWebStoreUninstall) {
     bool did_show = false;
     auto callback = base::BindRepeating(
         [](bool* did_show, extensions::ExtensionUninstallDialog* dialog) {
-          EXPECT_EQ("Remove \"Test\"?", dialog->GetHeadingText());
+          EXPECT_EQ("Uninstall Test?", dialog->GetHeadingText());
           *did_show = true;
         },
         &did_show);