Reland of name AppRTCDemo on Android and iOS to AppRTCMobile (patchset #1 id:1 of https://codereview.webrtc.org/2358133003/ )

Reason for revert:
Internal project is updated.

Original issue's description:
> Revert of Rename AppRTCDemo on Android and iOS to AppRTCMobile (patchset #2 id:20001 of https://codereview.webrtc.org/2343403002/ )
>
> Reason for revert:
> Breaks internal project.
>
> Original issue's description:
> > Rename AppRTCDemo on Android and iOS to AppRTCMobile
> >
> > The purpose is to make it clearer it is a mobile application.
> >
> > BUG=webrtc:6359
> > NOPRESUBMIT=true
> >
> > Committed: https://crrev.com/d3af58bdab5b25acd62cd816363becc7003d3e5a
> > Cr-Commit-Position: refs/heads/master@{#14356}
>
> TBR=sakal@webrtc.org,kthelgason@webrtc.org,tommi@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:6359
>
> Committed: https://crrev.com/87ef6f750126f9f17f4714d696a8e77a2dd0a3f1
> Cr-Commit-Position: refs/heads/master@{#14358}

TBR=sakal@webrtc.org,kthelgason@webrtc.org,tommi@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:6359

Review URL: https://codereview.webrtc.org/2373443005 .

Cr-Commit-Position: refs/heads/master@{#14391}

webrtc/examples/objc/AppRTCMobile/ios/ARDAppDelegate.h

@@ -10,7 +10,7 @@
 
 #import <UIKit/UIKit.h>
 
-// The main application class of the AppRTCDemo iOS app demonstrating
+// The main application class of the AppRTCMobile iOS app demonstrating
 // interoperability between the Objective C implementation of PeerConnection
 // and the appr.tc demo webapp.
 @interface ARDAppDelegate : NSObject <UIApplicationDelegate>

webrtc/examples/objc/AppRTCMobile/ios/ARDMainView.h

@@ -26,7 +26,7 @@
 
 @end
 
-// The main view of AppRTCDemo. It contains an input field for entering a room
+// The main view of AppRTCMobile. It contains an input field for entering a room
 // name on apprtc to connect to.
 @interface ARDMainView : UIView
 

webrtc/examples/objc/AppRTCMobile/ios/ARDMainView.m

@@ -137,7 +137,7 @@ static CGFloat const kCallControlMargin = 8;
 - (instancetype)initWithFrame:(CGRect)frame {
   if (self = [super initWithFrame:frame]) {
     _appLabel = [[UILabel alloc] initWithFrame:CGRectZero];
-    _appLabel.text = @"AppRTCDemo";
+    _appLabel.text = @"AppRTCMobile";
     _appLabel.font = [UIFont fontWithName:@"Roboto" size:34];
     _appLabel.textColor = [UIColor colorWithWhite:0 alpha:.2];
     [_appLabel sizeToFit];

webrtc/examples/objc/AppRTCMobile/ios/AppRTCMobile-Prefix.pch

@@ -9,8 +9,8 @@
  */
 
 //
-// Prefix header for all source files of the 'AppRTCDemo' target in the
-// 'AppRTCDemo' project
+// Prefix header for all source files of the 'AppRTCMobile' target in the
+// 'AppRTCMobile' project
 //
 
 #import <Availability.h>

webrtc/examples/objc/AppRTCMobile/ios/Info.plist

@@ -7,9 +7,9 @@
   <key>CFBundleDevelopmentRegion</key>
   <string>en</string>
   <key>CFBundleDisplayName</key>
-  <string>AppRTCDemo</string>
+  <string>AppRTCMobile</string>
   <key>CFBundleExecutable</key>
-  <string>AppRTCDemo</string>
+  <string>AppRTCMobile</string>
   <key>CFBundleIcons</key>
   <dict>
     <key>CFBundlePrimaryIcon</key>
@@ -21,11 +21,11 @@
     </dict>
   </dict>
   <key>CFBundleIdentifier</key>
-  <string>com.google.AppRTCDemo</string>
+  <string>com.google.AppRTCMobile</string>
   <key>CFBundleInfoDictionaryVersion</key>
   <string>6.0</string>
   <key>CFBundleName</key>
-  <string>AppRTCDemo</string>
+  <string>AppRTCMobile</string>
   <key>CFBundlePackageType</key>
   <string>APPL</string>
   <key>CFBundleShortVersionString</key>