[ios] Fix instance method conflicts in Showcase.

Showcase's protocol_alerter.mm is conflicting with OCMock.  Prefixing with
crsc_ instead.

Bug: 988423
Change-Id: I542b7df1374a285b3a8ecf293b682fa922d10fde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724654
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681816}

ios/showcase/common/protocol_alerter.mm

@@ -155,7 +155,8 @@ - (NSString*)crsc_description {
       [description appendString:@" "];
     [description appendString:keyword];
     [description appendString:@":"];
-    [description appendString:[self argumentDescriptionAtIndex:argumentIndex]];
+    [description
+        appendString:[self crsc_argumentDescriptionAtIndex:argumentIndex]];
     argumentIndex++;
   }
 
@@ -164,16 +165,16 @@ - (NSString*)crsc_description {
 
 // Return a string describing the argument value at |index|.
 // (|index| is in NSInvocation's argument array).
-- (NSString*)argumentDescriptionAtIndex:(NSInteger)index {
+- (NSString*)crsc_argumentDescriptionAtIndex:(NSInteger)index {
   const char* type = [self.methodSignature getArgumentTypeAtIndex:index];
 
   switch (*type) {
     case '@':
-      return [self objectDescriptionAtIndex:index];
+      return [self crsc_objectDescriptionAtIndex:index];
     case 'q':
-      return [self longLongDescriptionAtIndex:index];
+      return [self crsc_longLongDescriptionAtIndex:index];
     case 'Q':
-      return [self unsignedLongLongDescriptionAtIndex:index];
+      return [self crsc_unsignedLongLongDescriptionAtIndex:index];
     // Add cases as needed here.
     default:
       return [NSString stringWithFormat:@"<Unknown Type:%s>", type];
@@ -182,7 +183,7 @@ - (NSString*)argumentDescriptionAtIndex:(NSInteger)index {
 
 // Return a string describing an argument at |index| that's known to be an
 // objective-C object.
-- (NSString*)objectDescriptionAtIndex:(NSInteger)index {
+- (NSString*)crsc_objectDescriptionAtIndex:(NSInteger)index {
   __unsafe_unretained id object;
 
   [self getArgument:&object atIndex:index];
@@ -216,7 +217,7 @@ - (NSString*)objectDescriptionAtIndex:(NSInteger)index {
 
 // Returns a string describing an argument at |index| that is known to be a long
 // long.
-- (NSString*)longLongDescriptionAtIndex:(NSInteger)index {
+- (NSString*)crsc_longLongDescriptionAtIndex:(NSInteger)index {
   long long value;
 
   [self getArgument:&value atIndex:index];
@@ -225,7 +226,7 @@ - (NSString*)longLongDescriptionAtIndex:(NSInteger)index {
 
 // Returns a string describing an argument at |index| that is known to be an
 // unsigned long long.
-- (NSString*)unsignedLongLongDescriptionAtIndex:(NSInteger)index {
+- (NSString*)crsc_unsignedLongLongDescriptionAtIndex:(NSInteger)index {
   unsigned long long value;
 
   [self getArgument:&value atIndex:index];