Updating MacOs Host minimum versions to 10.10

We had a few places in strings and code which referenced older MacOs
versions as the minimum version, I've updated these so they should
be inline with reality.

Change-Id: I6f004754d25dd76a6b3d185f560b1e01a6f98eb5
Reviewed-on: https://chromium-review.googlesource.com/c/1300683Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604097}

remoting/host/installer/mac/BUILD.gn

@@ -119,7 +119,7 @@ mac_app_bundle("remoting_host_uninstaller") {
     "BUNDLE_ID=$uninstaller_bundle_id",
     "VERSION_FULL=$remoting_version_full",
     "VERSION_SHORT=$remoting_version_short",
-    "MACOSX_DEPLOYMENT_TARGET=10.7",
+    "MACOSX_DEPLOYMENT_TARGET=10.10",
   ]
 
   sources = [

remoting/host/installer/mac/ChromotingHost.pkgproj

@@ -669,7 +669,7 @@
 							<key>LANGUAGE</key>
 							<string>English</string>
 							<key>VALUE</key>
-							<string>@@HOST_NAME@@ requires 10.6 or newer.</string>
+							<string>@@HOST_NAME@@ requires 10.10 or newer.</string>
 						</dict>
 					</array>
 					<key>NAME</key>

remoting/resources/remoting_strings.grd

@@ -1343,7 +1343,7 @@ Securely access your computer from your iOS device. It's fast, simple and free.
         For Windows 7 and above
       </message>
       <message desc="Platform-specific text indicating that a component is for the Mac OS." name="IDS_FOR_PLATFORM_MAC">
-        For Mac (OS X Mavericks 10.9 and above)
+        For Mac (OS X Yosemite 10.10 and above)
       </message>
       <message desc="Text for the button the user clicks to indicate that they agree to the terms of service and want to proceed with downloading the installer." name="IDS_ACCEPT_AND_INSTALL">
         Accept and Install